Ready, set, send. This next generation of our award-winning Smith Forefront mountain bike helmet has your back (and front, and sides) thanks to MIPS® and complete Koroyd® impact protection. Designed to work with goggles or sunglasses, the helmet vents warm air, eliminating foggy lenses so you\'ll feel confident even if your line of sight is less than ideal. And when your palms start to sweat right before you drop in, you\'ll stay cool thanks to a full 20 vents that keep the air flowing. The visor adjusts for easy goggle storage between laps, and you can slide your glasses for secure storage on the front or back. Key Features: 2 fixed vents for consistent airflow,Three-position adjustable visor,XT2® antimicrobial lining offers sweat-activated odor control, Lightweight, low-bulk single-layer webbing,Front and rear eyewear storage channels, Sizes: S - 51-55cm, M - 55-59cm, L - 59-62cm,.Protection Complete Koroyd® coverage for lightweight, energy-absorbing and ventilated impact protection,MIPS® Brain Protection System reduces rotational forces caused by angled impacts to the head,Integrated skeletal structure creates a roll cage for added strength and impact protection,CPSC and CE EN 178 certified,. Fit / Integration Designed for ultimate integration with Smith performance goggles for maximum comfort, venting and storage convenience, AirEvac™ ventilation system integrates with Smith goggles for fog-free lenses, VaporFit™ dial adjustment system offers 27-degree fit adjustment with the turn of a dial .