Fit, Protection, Style At TLD, styling, graphics, fit, function and safety are key in everything we create. After years of research and development, the Troy Lee Designs Team introduced the A1 helmet in 2013. We made one of the most comfortable MTB helmets on the market even safer with the addition of MIPS rotational brain protection. This lightweight, fully encapsulated all-mountain helmet utilizes maximum coverage and dimension to keep you safe and protected in all riding conditions. Whether you&';re charging singletrack, riding dirt jumps or grinding out miles on the XC bike, the A1 helmet offers the premium fit, protection and style you want. "The A1 Classic MIPS Helmet takes top safety honors, earning a perfect 5-star rating in Virginia Techs impact test and was the number one tested mountain bike helmet." - VA Tech Helmet Testing Lab FEATURES: MIPS - One of the lightest and slimmest systems and the most integrated by MIPS. MIPS intends to reduce rotational force to the head on certain angled impacts. Superior ventilation and integration highlights this design in the A1. A1 Ventilation - 16 port hi-flow cooling system Cam Lock - Adjustable, cam-lock strap dividers allow customization for different head shapes and riding styles. EPS - This lightweight, fully encapsulated all-mountain helmet utilizes maximum overage and dimension to keep you safe and protected in all riding conditions Impact Liner - Whether you&';re charing singletrack, riding dirt jumps or grinding out miles on the XC bike, the A1 helmet offers the premium fit, protection and style you want Vistor Screws - Innovative break-away visor screws SPECIFICATIONS: Featuring MIPS Brain Protection System - a helmet integrated, low friction layer designed to reduce rotational motion transferred to the brain from angled impacts to the head EPS impact liner maximizes impact protection while minimizing weight Innovative break-away visor screws 16 port hi-flow cooling system both pulls and pushes air for maximum ventilation Ultra-plush quick-dry comfort liner is both removable and washable for maximum ventilation Adjustable, cam-lock strap dividers allow customization for different head shapes and riding styles CPSC 1203*, CE EN1078*, *Varies by regional standards WHAT&';S IN THE BOX: HELMET BAG - Draw string helmet bag. VISOR SCREWS - 2 side visors screws MEDICAL EMERGENCY INFORMATION VISOR STICKER - Visor sticker for important medical information in case of an emergency EXTRA STICKERS - Extra A1 and TLD sticker pack HOW TO FIT: MEASURE YOUR HEAD With a fabric tape measure around the circumference of your head holding the tape just above your eyebrows and ears. 1" = 25mm