Adults

The Giro Cinder MIPS provides all the features an avid road rider wants in a lightweight package. The design is inspired by the classic aesthetic of their premium Synthe helmet, offering similar performance and style. Key features include the Roc Loc 5 fit system, which allows you to easily dial in fit tension and adjust vertical position with a single hand. Air-FX padding offers comfort on your longest rides, and the helmet is equipped with MIPS to redirect impact energy, providing more protection in certain impacts.

For trail or town Built for riders who live active lifestyles and want to stay protected, the Quantum cycling helmet looks just as good as it fits. Featuring MIPS, Multi-directional Impact Protection System, superior ventilation, and excellent coverage. Get it all and even more with a removable visor allowing Quantum to be your go-to helmet no matter what type of riding. MIPS (Multi-directional Impact Protection System) was developed by brain surgeons and scientist to help reduce rotational forces on the brain caused by angled impacts to the head. Key features - MIPS Brain Protection System - The Boa System lets riders easily secure and adjust helmet fit with one hand - In-mold composite skeleton increases helmet integrity for larger vent variations - Soft, comfortable, moisture-wicking, and washable helmet pads - Internal, recessed channels move airflow over your head to stay cool and dry - Removable snap-on visor and port covers provide multiple looks to fit your style - LockDown dividers make helmet strap management clean and are easy to adjust - Crash Replacement Guarantee provides a free helmet replacement if involved in a crash within the first year of ownership

An off-road helmet with WaveCel technology that balances comfort and performance for trail riders who value safety. A major advancement in the protection against cycling-related head injuries Rally WaveCel is a high-style, high-value off-road helmet with trail-specific features and WaveCel, a leading technology in the protection against cycling-related head injuries. WaveCel is a collapsible cellular structure that lines the inside of the helmet. This Bontrager-exclusive technology disrupts the safety standards the industry has accepted for over 30 years. Product details - WaveCel advanced helmet technology - Virginia Tech 5 STAR rating - BOA Fit System lets you easily secure and adjust your helmet fit with one hand - Adjustable visor offers multiple coverage options - Extended back-of-helmet shell offers additional rear protection - LockDown dividers make helmet strap management clean and easy to adjust - Soft, comfortable, moisture-wicking, and washable helmet pads - Crash Replacement Guarantee provides a free helmet replacement if involved in a crash within the first year of ownership Specifications - Size (head circumference): Small (51-57cm) / Medium (54-60cm) / Large (58-63cm) - Fit system: Boa - Pad material: Moisture-wicking pads - Buckle type: Standard buckle - Includes: Crash Replacement Guarantee - Weight: 360g (Small) / 400g (Medium) / 430g (Large)

- In-molded construction - TransTextura moisture-wicking, anti-odor inner padding - MIPS Protection - Optional visor on Path MTB helmet Sizing: - Small/Medium = 49 – 57cm - Medium/Large = 53 – 61cm

Comfortable and airy — you'll love Cannondale's Teramo helmet. Featuring a durable, one-piece polycarbonate outer shell with aluminum reinforcements, this lightweight lid also sports 23 massive vents for exceptional airflow. It even boasts dual-density EPS foam for protection without bulk. The retention system offers EVA foam padding and soft-touch straps with cam-lock dividers that let you dial in the perfect fit. - Small/Medium = 52-58cm - Large/X-Large = 58-62cm

Bontrager's Circuit WSD is a lightweight road helmet that features massive vents for maximum airflow. It features their one-hand-adjustable Headmaster fit system, plus it has an in-mold strap retention system with FlatLock strap adjusters for a superb fit and serious safety. The premium fit pads not only give you a custom feel, they also help keep your head dry on those hot rides. - Small = 51-57cm - Medium = 54-60cm

Comfort. Fit. Style. Those three words sum up Bontrager's Starvos perfectly, and yet, somehow only tell part of the story. Of course safety is the number one priority, so the Starvos uses an In-Mold composite skeleton. This not only provides excellent protection, but it also allows for huge, thoughtfully placed vents that manage airflow over your head for cooling. Dial in a custom fit quickly with the Headmaster II one-handed system. Plus, soft, moisture-wicking, and washable helmet pads along with FlatLock Strap Dividers make it incredibly user-friendly.

The Radix MIPS W helmet combines rugged style and durability to meet the demands of core trail riders, with the coverage, light weight, and ventilation riders need to ride comfortably and confidently all day. The Women's Radix MIPS W helmet is for the rugged adventurer who appreciates a perfect fit, the sun staying out of their eyes, and plenty of ventilation. The highly adjustable Roc Loc 5.5 MIPS system allows you to customize fit and feel for enhanced stability and long-range comfort while providing an added measure of protection from rotational forces in the event of an angled impact. The P.O.V. visor offers 15 degrees of adjustment, and the tough polycarbonate outer shell is fused permanently to the EPS foam liner using our In-Mold construction process, to enhance durability and ventilation without excess bulk. Specs: - Integrated MIPS - Construction: In-mold polycarbonate shell with EPS liner - Ventilation: Wind tunnel vents with internal channeling - Fit System: Roc Loc 5.5 MIPS - Weight: 316g (Size Medium CPSC); 300g (Size Medium CE) - Certification: Complies with the US CPSC Safety Standard for bicycle helmet for persons age 5 and older, E.U.: CE EN1078 - Highlights: P.O.V. Adjustable visor, Quick dry padding, Slimline webbing

The combination of innovative design, the latest technology, outstanding functionality, maximum ventilation, and low weight make the Aventor a real allrounder. The Aventor is the perfect helmet for cyclists who need a cool head for riding in high temperatures and on challenging stages. - Double shell, in-mold construction for durable fusion of the outer shell with the shock-absorbing helmet material (EPS) - Lower edge protection provides the helmet with additional protection coverage - ActiCage, structural reinforcement integrated into the EPS, optimizes stability - Zoom Ace, fine adjustment system with handy dial provides a personalized fit - Half-surrounding plastic ring connected to adjustment system - Ponytail compatible - Fidlock magnetic strap buckle Sizing: - Small: 51 – 55cm - Medium: 54 – 58cm - Large: 57 – 61cm

Ride smart. It's a no brainer. If you're going to rock a helmet on an Electra, rock an Electra on your helmet. Choose between awesome colors and graphics that fit your style. Electra helmets: Making messy hair cool since 2016. - Durable ABS hardshell for protection and EPS foam liner for security - Size small fits circumference 48cm - 54cm and hat sizes 6 1/2 - 6 3/4 - Size medium fits circumference 55cm - 58cm and hat sizes 6 7/8 - 7 1/4 - Size large fits circumference 59cm - 61cm and 7 3/8 - 7 5/8 - Small size generally fits children while medium and large sizes fit adults - Fit System: HB-80 - Pad Material: Moisture-wicking pads - Buckle Type: Standard buckle

The Source MIPS helmet combines advanced performance and protection in a rugged, trail-ready design. Featuring deep coverage with aggressive ventilation from 16 vents coupled with deep internal channeling, it helps keep things cool even when the riding gets rowdy. And with the comfort and secure feel of the Roc Loc 5 fit system with Integrated MIPS brain protection, plus a moto-style adjustable screw-in visor and full lower Hardbody durability, you get a helmet that's capably equipped for fun and adventure. MIPS: - Integrated MIPS (Multi-Directional Impact Protection System)—allows you to customize fit/feel for great stability and long-range comfort while providing an added measure of protection from rotational forces in the event of an angled impact Construction: - In-Mold polycarbonate shell and EPS liner - Polycarbonate Hardbody lower shell Visor: - Adjustable moto-style screw-in visor Interior/liner type: - Coolfit anti-microbial padding Ventilation type: - 16 Wind Tunnel Vents with internal channeling Fit system: - Roc Loc 5 Impact liner type: - EPS foam liner Product weight: - 340g (size Medium)

Conquer with confidence. Give yourself the confidence to crush it. Whether you’re making the crux move on a technical climb or bombing down the mountain on steep, rocky terrain, you need full protection to perform at your peak. The new Rail SX was developed to meet the demands of the Giant Factory Off-Road Team’s pro enduro riders. It features an integrated MIPS Brain Protection System, and a lightweight, highly ventilated design to keep you comfortable and in control when you’re pushing your limits. FEATURES - Trail-specific maximum enduro coverage EPS construction; 3mm lower (Front), 3-5mm lower(sides), 8-10mm lower (back) - MIPS Brain Protection System optimized design - AirFlow ventilation combines 18 straight vents with straight, non-tapered walls to guide airflow through deep internal channels to keep riders cool at variable speeds - Removable moto-style extended protection visor mounts cleanly to the sides and is infinitely adjustable on the move - Integrated strap clip on the rear keeps goggle straps in position and prevents them from falling off during a crash - Low-speed and high-speed impact-tuned construction with Direct Support vents, optimized low-density EPS, and ultra-thin toughened polycarbonate shells all in-mold bonded together - Element Strap System (ESS) brings together Cinch One Pro fit system, adjustable locking dividers, and LiteForm webbing into one fit and retention system for superior fit and comfort right out of the box - Cinch One Pro fit system offers 360-degree coverage and positioning with secure, adjustable height for full protection, support and comfort - Lightweight LiteForm webbing wraps around for a more secure fit - TransTextura Plus anti-microbial padding helps fight bacteria growth by pulling sweat from a rider’s head and transferring it through the AirFlow vents. The natural property of the fabric inhibits microbes that cause odors - Dual-position integrated mounting surfaces, GoPro™ curved mount compatible for cameras and the new Giant Recon light system SPECIFICATIONS - Western: S (51-55cm);M (55-59cm);L (59-63cm) - Weight: 360g (size M, CPSC/CE) - Certifications: CPSC/CE;AS/NZS

Giro's Ember MIPS provides all the features an avid road rider wants in a lightweight package. The design is inspired by the classic aesthetic of Giro's premium Synthe helmet, offering similar performance and style. Key features include the Roc Loc 5 fit system, which allows you to easily dial in fit tension and adjust vertical position with a single hand. Air-FX padding offers comfort on your longest rides, and the helmet is equipped with MIPS to redirect impact energy, providing more protection in certain impacts. With graphic options that coordinate with the Giro women’s road collection, the Ember MIPS is the pinnacle of style on the road.

All-purpose, value-packed helmet balances performance and comfort. Value-packed protection Wear it and believe it. The Solstice is proof you don't have to spend a lot of money to get a great fitting, easy-to-use cycling helmet designed to keep you protected during all your bike riding adventures. Product details - Designed for larger vents and increased airflow while maintaining structural integrity - Built-in and removable visor options give you two choices for constant coverage - Intuitive, one-handed Headmaster fit system adjusts height and circumference - LockDown dividers make helmet strap management clean and easy to adjust - Internal, recessed channels move airflow over your head to keep you cool and dry - Soft, comfortable, moisture-wicking, and washable helmet pads - Crash Replacement Guarantee provides free helmet replacement if it is involved in a crash within the first year of ownership Specifications - Size (head circumference): Small/Medium (51-58cm); Medium/Large (55-61cm) - Fit system: Headmaster II - Pad material: Moisture wicking pads - Buckle type: Standard buckle - Includes: Visor plugs - Weight: 290g (Small/Medium)

A stylish road helmet with advanced WaveCel technology that balances comfort and performance for all riders who value safety. A major advancement in the protection against cycling-related head injuries Starvos WaveCel is a versatile, high-value cycling helmet for new-to-seasoned riders who want the added protection of WaveCel, a leading technology in the protection against cycling-related head injuries. WaveCel is a collapsible cellular structure that lines the inside of the helmet. This Bontrager-exclusive technology disrupts the safety standards the industry has accepted for over 30 years. Product details - WaveCel advanced helmet technology - Virginia Tech 5 STAR rating - Intuitive, one-handed Headmaster fit system makes height and circumference adjustments easy - LockDown dividers make helmet strap management clean and easy to adjust - Soft, comfortable, moisture-wicking, and washable helmet pads - Available in XL sizing - Crash Replacement Guarantee provides a free helmet replacement if involved in a crash within the first year of ownership Specifications - Size (head circumference): Small (51-57cm) / Medium (54-60cm) / Large (58-63cm) / X-Large (60-66cm) - Fit system: Headmaster II - Pad material: Moisture-wicking pads - Buckle type: Standard buckle - Includes: Crash Replacement Guarantee - Weight: 300g (Small) / 335g (Medium) / 370g (Large) / 385g (X-Large)

Quantum helmets feature superior ventilation, excellent coverage, and Bontrager's signature out-of-the-box comfort. A removable visor feature adds incredible ease-of-use by allowing Quantum to be your go-to helmet no matter what the type of ride. MIPS, "Multi-directional Impact Protection System," sets a new standard in helmet safety. Developed by brain surgeons and scientists, MIPS helps reduce rotational forces on the brain caused by angled impacts to the head. - Equipped with MIPS Brain Protection System - In-mold composite skeleton increases helmet integrity and larger vent variations - Intuitive, one-handed Headmaster fit system adjusts height and circumference - Soft, comfortable, moisture-wicking, and washable helmet pads - Internal, recessed channels manage airflow through the helmet and over the head - Removable snap-on visor with visor port plugs - Small = 51-57cm - Medium = 54-60cm - Large = 58-63cm - X-Large = 60-66cm

When it's time to hit the road, the Agilis MIPS offers a sporty, sleek style with comfortable features you can count on, including 32 wind tunnel vents, Coolfit anti-microbial padding, and integrated MIPS technology. The fit on the Agilis MIPS is comfortable and secure thanks to our adjustable Roc Loc 5.5 MIPS system that combines fit and positioning adjustments while integrating with MIPS technology for an added measure of protection in the event of an angled impact. The outer Hardbody shell extends to the inside of the helmet, and is molded from a tough polycarbonate thats fused permanently to the EPS foam liner using our In-Mold process to enhance durability and ventilation without excess bulk. - 32 Wind tunnel vents with internal channeling - Full-wrap in-mold polycarbonate shell with EPS liner - Coolfit anti-microbial padding - Featherweight webbing with Slimline buckle - Roc Loc 5.5 MIPS fit system

The Syntax MIPS combines a touch of European flair with slightly deeper coverage and high-performance features—all tucked into a very slim design. The outer shell is molded from a tough polycarbonate that’s fused permanently to the EPS foam liner using Giro's In-Mold construction process to enhance durability and ventilation without excess bulk. The fit is luxurious and secure, thanks to the highly adjustable Roc Loc 5 Air MIPS system that allows you to customize fit/feel for great stability and long-range comfort. Another benefit is integrated MIPS which can provide an added measure of protection from rotational forces in the event of an angled impact. MIPS - Integrated MIPS (multi-directional impact protection system)—allows you to customize fit/feel for great stability and long-range comfort while providing an added measure of protection from rotational forces in the event of an angled impact CONSTRUCTION - In-mold construction - Four-piece polycarbonate interlocking hardbody shell - Full hardbody wrap SHELL TYPE - Polycarbonate shell SPORT - Cycling NUMBER OF VENTS - 25 INTERIOR/LINER TYPE - Coolfit anti-microbial padding VENTILATION TYPE - Wind tunnel vents with internal channeling GENDER - Unisex FIT SYSTEM - Roc Loc 5 Air IMPS MIPS IMPACT LINER TYPE - EPS CERTIFICATION - US CPSC bicycle for ages 5+ - EU: CE EN 1078

The Verce MIPS is well-equipped to help you blaze new trails. Giro's Roc Loc Sport system allows you to quickly and easily dial in your fit and the plush, quick-dry padding provides a comfortable feel. Verce MIPS also features an integrated Multi-Directional Impact Protection System (MIPS), which can redirect energy and provide more protection in certain impacts. And with a range of colors to choose from, you can be sure that you'll find a helmet that fits your style and looks great, too. - 50 – 57cm / 19.75 – 22.5 in.

When you're riding serious trails, you need serious protection. Bontrager Blaze WaveCel offers the best in performance and protection on any trail, from flowy singletrack to gnarly downhills. It’s built for style, comfort, and performance, and equipped with the industry's best safety tech for whatever trails you roam. WaveCel is a collapsible cellular structure that lines the inside of the helmet. This Bontrager-exclusive technology disrupts the safety standards the industry has accepted for over 30 years. - WaveCel advanced helmet technology - The Boa System lets you easily secure and adjust helmet fit with just one hand - Fidlock magnetic buckle fastens effortlessly for a quick, secure fit - Front Blendr mount system easily integrates GoPro camera and Bontrager light accessories - AgION antimicrobial pads wick away moisture and eliminate odors naturally - Additional NoSweat pad with silicone channel keeps sweat out of eyes for constant clarity - Drop-in coverage on back of helmet offers extended protection - Crash Replacement Guarantee provides a free helmet replacement if involved in a crash within the first year of ownership Sizing: - Small: 51-57cm - Medium: 54-60cm - Large: 58-63cm

Capable coverage, comfortable protection Find the perfect fit in a stylish lid. Starvos offers protection, airflow management, and comfort in a wide range of color options. It comfortably fits a wide range of head sizes, allowing you to find the right fit every time. Product details - In-mold composite skeleton increases helmet integrity and larger vent variations - Intuitive, one-handed Headmaster fit system adjusts height and circumference - Soft, comfortable, moisture-wicking, and washable helmet pads - FlatLock dividers make helmet strap management simple through fixed position fit - Internal, recessed channels manage airflow through the helmet and over the head - Crash Replacement Guarantee provides a free helmet replacement if involved in a crash within the first year of ownership

The women's Radix MIPS helmet combines rugged style and durability to meet the demands of core trail riders, with the coverage, lightweight, and ventilation riders need to ride comfortably and confidently, all day. The Radix MIPS helmet is for the rugged adventurer who appreciates a perfect fit, the sun staying out of their eyes, and plenty of ventilation. The highly adjustable Roc Loc 5.5 MIPS system allows you to customize fit and feel for enhanced stability and long-range comfort while providing an added measure of protection from rotational forces in the event of an angled impact. The P.O.V. Visor offers 15 degrees of adjustment, and the tough polycarbonate outer shell is fused permanently to the EPS foam liner using our in-mold construction process, to enhance durability and ventilation without excess bulk. - Construction: Full-wrap in-mold polycarbonate shell with EPS liner - Sport: Cycling - Number of vents: 25 - Ventilation type: Wind tunnel vents with internal channeling - Fit system: Roc Loc 5.5 MIPS

TACKLE NEW TRAILS. With authentic off-road style and a comfortable fit, this helmet delivers it all for aspiring adventurers. FEATURES - We've got you covered! 1 year crash replacement program. - Created for the off-road enthusiast seeking performance features but with budget in mind - Trail-specific design with extended rear coverage - Airflow ventilation system with deep internal airflow channels for cooling - Cinch Pro fit system offers optimal coverage by cradling the occipital bone for full protection, support and comfort - Removable, moto-style extended protection side-snap visor - Integrated magnetic mount for the Numen+ Link taillight and GoPro compatible mounting surface - MIPS mimics the brain's own protection system by adding a low friction layer between the head and the helmet reducing rotational violence that causes strain to the brain at angled impacts SPECIFICATIONS - Western: S (51-55cm);M (55-59cm);L (59-63cm) - Weight: 365g (size M) - Certifications: CPSC/CE;AS/NZS)

The Register MIPS helmet combines sleek design and lightweight construction to match your style, on the road or trail. Made in a comfortable Universal Fit size with Giro's convenient Roc Loc Sport fit system, the Register MIPS adjusts with a simple turn of the dial so you can tune the fit in seconds. A range of colors lets you choose exactly how your on-bike style comes together. Register MIPS models also have an integrated Multi-Directional Impact Protection System, which can redirect energy and provide more protection in certain impacts.

The Fixture MIPS brings confident mountain bike style and breezy ventilation together in a compact design that complements nearly any ride -- especially when there's dirt under tread. Some of Giro's best features, like In-Mold construction coupled with the ease and comfort of their acclaimed Roc Loc Sport fit system, offer the versatility you need to ride everything from fire-road adventures to swooping singletrack trails. The Roc Loc also is seamlessly integrated with the Multi-Directional Impact Protection System (MIPS), which can redirect energy and provide more protection in certain impacts.

The Eclipse Spherical is both the fastest road helmet and the coolest aero road helmet Giro has ever created, bringing our best technologies together in a light, compact form that's ideal for road and gravel racing. The sleek outer shell actively streamlines airflow to reduce drag across multiple wind angles, while 14 Wind Tunnel vents pull air through the helmet to provide incredible cooling power that rivals our most aggressively vented road helmets. Inside, the ball-and-socket design of Spherical Technology is powered by the MIPS brain protection system, which allows the helmet's outer EPS foam liner to rotate around the inner foam liner during a crash to help redirect impact forces away from the brain. Progressive Layering of both the inner and outer liners help to offer more comprehensive protection, too. The patented Roc Loc 5 Air system enhances stability and fit, and plush antimicrobial Ionic+ padding helps absorb sweat and moisture while providing durable antimicrobial performance.

The Escape MIPS is the ideal choice for today's on-the-go lifestyle. The sleek shape of the Escape MIPS offers great ventilation and deep coverage, with a durable ABS plastic shell and integrated, rechargeable LED lights front and rear. The integrated front light offers bright "be seen" white light while the rear light shines bright red for substantially increased visibility to drivers and other road users. The fit is luxurious, with an adjustable Roc Loc Sport MIPS system that provides superior fit comfort with enhanced stability at the turn of a dial. The Escape MIPS also is equipped with an Integrated MIPS brain protection system, which can help to redirect impact forces to provide an additional measure of protection in certain impacts.

A lightweight in-mold design with built-in front and rear LED lights and remote handlebar-activated turn signals is the perfect accessory for the daily commute through the urban jungle. STANDOUT STYLE WITH BOLD VISIBILITY Choose to ride, choose to be seen. The Ethos™ Mips® is a revolution in transportation, with a compact and stylish form featuring the added protection of Mips® Brain Protection System highlighted by integrated LED front white lights, rear red lights, and amber turn signals, all controlled via an intuitive handlebar remote. The entire system is USB-C rechargeable with an estimated run time of 10 hours in low-blink mode and 5 hours in the high-blink mode, which delivers 45 lumens front and 30 lumens rear. Helmet and remote can be fully charged in just 2 hours and 1 hour, respectively. The Ethos Mips features a TPU soft rubber waterproof brim. (The Ethos Mips also is available with a clear, molded eye shield as the Ethos Mips Shield). Despite the added technology, in-mold construction keeps the weight manageable, full hardbody coverage adds durability, and a Roc Loc® City Mips fit system plus quick-dry padding ensure comfort. Whether you're a dedicated bike commuter, running the kids to school on your e-cargo bike, or simply looking for added visibility as you ride around town, the Ethos Mips is a look into the future. Highlights: - Built-in front (white) and rear (red) LEDs - Handlebar-activated turn signals (amber/yellow) - Micro-USB C rechargeable - Deep coverage - Quick-dry padding

- In-molded construction - TransTextura moisture-wicking, anti-odor inner padding - MIPS Protection - Optional visor

The Sphere MIPS delivers a perfect combination of great looks, all day comfort, performance and features to help protect in the event of an impact. You will look forward to every ride in the Lazer Sphere MIPS helmet. The ARS Fit System enables progressive fit adjustment via a thumbwheel. It distributes pressure evenly around the head, eliminating hot spots and pressure points. The adjustable head basket is ponytail friendly. Eighteen vents orientated at a 15-degree angle assures maximum airflow when the helmet is in the riding position. MIPS protection helps reduce the risk of rotational injury. A polycarbonate layer built inside the helmet keeps the foam together in the event of a crash, offering better protection from successive impacts. Sphere MIPS has been awarded the 5-Star "Best Available" protection rating from Virginia Tech. A docking area makes eyewear storage easy and bottom-shell protection helps prevent damage to the helmet foam. The optional Aeroshell accessory protects against the helmets or offers an aerodynamic benefit when desired. The Sphere MIPS weighs just 280 grams. WEIGHT: 280g (size small) MATERIAL: EPS Foam, Polycarbonate, Nylon FIT SYSTEM: Advanced Rollsys System (ARS) VENTILATION: 18 ROTATIONAL PROTECTION: MIPS CERTIFICATION: CPSC ACCESSORIES: Optional Aeroshell Sizing: - Small = 52 – 56cm - Medium = 55 – 59cm - Large = 58 – 61cm Features: Lazer Aeroshell compatible Multi use polycarbonate cover which fits over top of your helmet. It covers the front and side vents to protect your head from rain and cold or to gain an aerodynamic advantage. Adjustable Head Basket Allows the back part of the retention system to be adjusted up and down depending upon your preference and comfort. The nylon ratchet system can be pushed high and out of the way, or low for a feeling of increased security. Advanced Rollsys System (ARS) Easily adjust your helmet's fit by using the thumbwheel on the top of the helmet. Lazer's unique fit system prevents hotspots or pressure points by making the adjustment around the entire circumference of the head. MIPS layer The Multi-Directional Impact Protection System (MIPS) helps reduce the risk of rotational brain injury by isolating your head from the rotation of the helmet shell in the event of an impact. 5-star protection rating The Virginia Tech impact testing uses the STAR evaluation system to determine the helmet's ability to reduce linear acceleration and rotational velocity of the head resulting from a range of impacts a cyclist might experience. 5-star indicates the "Best Available" rating possible. Virginia Tech recommends the use of any 4- or 5-star rated helmet. Well ventilated Carefully designed vents and internal channeling pull air into the helmet and across your head for increased airflow. Essential for performance and comfort during high temperatures and hard efforts.