Construction: This road bike helmet is IN-MOLD construction. Abrasion resistant PC outer shell slip and slide in event of crash to minimize the risk of torsion injuries, While impact forces are absorbed maximumly by thickened EPS foam inside. Detachable Shield: Detachable magnetic goggles avoids from glare and offers full clear vison front in daytime. It stay firmly on helmet when it on and It can be flipped up or remove by one hand easily, NO DISCOMFORT WITH CYCLING/PRESCREPTION GLASSES ON UNDER THIS GOGGLES(wear your own glasses firstly before you put on this eye shield).The spare lens: Yellow(nighttime use) and Rainbow(daytime use) are available to purchase Cool and Comfort: The 8 air vents and air flow channels inside is designed with shortened airflow tail shaped on base of aerodynamics . Air flow(in and out) are regulated and balanced to interact to cool down the temperature around head, making the experience of cycling is fatigue-free and comfortable Lightweight: With shortened airflow tail shaped and Goggles, This bicycle helmet is 340g. Sense of weight-bearing is barely noticed on head because of the lightweight and durable material. Cycling is kind of sports with physical strength demanding, especially for a long distance race. Neck pain or strain always result in tough and laborious experience. This helmet is the one lightweight and durable you need Adjustment Retention System: Dial fit retention system can be adjusted to fit head circumference 22.05-24.01 inches(Adult Size 56-61 cm). To secure perfect fit of helmet on your head, please measure your head circumference correctly before purchasing.

NEW AND IMPROVED: Fits head circumference from 21 to 23 inches (54-58 cm) - PLEASE MEASURE YOUR HEAT FOR A PERFECT FIT! PLEASE NOTE THAT THIS IS NOT A VERY BIG HELMET (8.5" x 12.5"). If you have a bigger head this helmet will NOT fit you! VISOR: The magnetically fastened shield provides wraparound eye (UV) protection and it’s easy to flip up or remove with one hand when appropriate. (PLEASE NOTE: The visor can only be attached while wearing the helmet (NOT BEFORE YOU ARE PUTTING ON THE HELMET) and can only be detached while you are wearing the helmet - YOU CAN NOT TAKE THE HELMET OFF WITH THE VISOR ATTACHED TO IT). WEARING THE HELMET WITH VISOR WILL BE A TIGHT FIT AND THIS SETUP MAY NOT FIT A LARGER SIZE HEAD OR FACIAL FEATURES. KEEPING YOU COOL: Your aero cycling helmet is equipped with a total of 8 vents: 4 in the front and 4 in the back, offering optimal airflow and minimal wind resistance to keep you cool during a race and stay more comfortable without sweat all over the head. FEATHERWEIGHT: With a helmet weight of 279 gms (with shield) you'll soon forget that you've even got a helmet on your head- until you need it! This helmet is about 25% lighter and smaller ( 8.5" x 12.5") than other aero helmets. HARDSHELL: Tough on the outside, soft on the inside, just like nature intended. Our low friction, abrasion resistant PET outer shell is designed to slip and slide in the event of a crash; helping to minimize the risk of torsion injuries.

Lightweight Aerocore in-mold construction Zonal ventilated protection featuring patented Koroyd material MIPS system available in all colors VaporFit adjustable fit system XT2 anti-bacterial performance lining

SMALLER AIR RESISTANCE: ROCK BROS Newest road bike aero helmet, teardrop shape provides a best aerodynamic efficiency and ensure the air flow more smoothly. In the Wind Tunnel Testing, ROCK BROS aero helmet get a excellent performance. Comparison with ordinary road bike helmet, this aero helmet have more than 40% decrease of air resistance. EXCELLENT HEAT DISSIPATION: Comfortable temperature from excellent heat dissipation. Called "FORCED AIR COOLING", A wider vent in the front of helmet working with 4 deep internal channels insides are the best combination of aerodynamics and ventilation, which can aspirate more cool air to keeping the comfortable temperature, give you a enjoyable cycling experience. SAFETY CONSTRUCTION: Aero helmet is made of Multi-Density EPS and high toughness PC shell with Integral Moulding Technology. Because of this well impact toughness material, helmet protection system can work great while hitting. EASY-USE ADJUSTMENT SYSTEM: The latest magnetically helmet fastener, side strap adjust button and size adjust dial make up the easy-use adjustment system, which is good for the helmet adjust to different head size and more suitable for both men and women. (Suitable For Head Circumference from 22 to 24 inches) COMFORTABLE & DETACHABLE PAD: Detachable and washable pad design for increased comfort and absorb sweat. Also you don't need worry about pad getting wet, good gas permeability can keep pad clean and no peculiar smell.

Shell Material: Aerocore In-mold Impact Foam: Koroyd Ventilation: 2 rear exhaust vents Fit Adjustment: VaporFit Adjustable Fit System, AirEvac Ventilation Claimed Weight: 330g

MARKET-LEADING PROTECTION: Engineered in Giro’s category-leading helmet test lab FAST: Record-breaking speed and aerodynamic efficiency MIPS: Utilizes the Multi-Directional Impact Protection System to redirect energy in a crash VIVID SHIELD: Fully magnetic for easy on/off plus VIVID lens technology and Optics by Zeiss that increases contrast and definition while keeping colors true to life VENTILATION AND COMFORT: Roc Loc Air suspends the helmet just slightly off the top of the head allowing airflow to pass over the head and exhaust from the rear. Easily adjust vertical position and tension with the Roc Loc 5 fit system

BEAT THE CLOCK - Race-proven aero technology that doesn’t skimp on comfort and fit. For triathlon or time trial competition, this is how you beat the clock SEAMFLEX EARFLAPS & FUSION IN-MOLD POLYCARBONATE SHELL - Seamflex earflaps make it quick and easy to put on or remove. A process pioneered by bell bonds the helmet's outer shell to the eps foam liner to create a sturdier helmet X-STATIC AND XT2 PADDING - Quick-drying materials, woven with real silver fibers, inhibit growth of odor-causing bacteria and fungi SPECIFICATIONS - Small (51-55 cm), Medium (55-59 cm), and Large (59-63 cm) and Universal Youth Size (50–57 cm); 3 Total Vents; Lightweight Straps Retention System.

Designed for maximum aerodynamics and ventilation with huge airflow ports for tri and TT. Magnetic vent cover and visors included. Light weight with great fit.

MARKET-LEADING PERFORMANCE AND PROTECTION: Engineered in Giro’s helmet test lab AERODYNAMIC DESIGN: TransformAir Technology reduces drag and provides aerodynamic efficiency. INTEGRATED MIPS: MIPS Brain Protection System is integrated with the Roc Loc 5 Air Fit System for an added measure of protection in certain impacts plus market-leading fit and comfort. VIVID SHEILD: Fully magnetic for easy on/off plus VIVID lens technology and Optics by Zeiss that increases contrast and definition while keeping colors true to life. VENTILATION AND COMFORT: 10 Wind Tunnel vents coupled with internal channeling allow air to flow through the helmet to enhance cooling power. Easily adjust vertical position and tension with the Roc Loc 5 Air fit system.

Streamlined: Features in-mold construction with four vents; inner evacuation channels; retractable ear; and textured front for better laminar airflow. Easy to adjust: Spiderlock Pro TT stabilizing system and Pro-lock adjustment straps allow for a customized fit. Details: Meets ASTM, CEN, and AS safety standards for biking. Weighs 350g (12.4oz). Keeps you cool: Icefil padding helps keep your head cool. Protective: Includes improved, P-09 lens for eye protection.