Key Features: 19 Openings for effective ventilation.Reinforced with embedded rigid frame.Vacuum formed polycarbonate.Extended side protection.Comfort liner with quick-dry anti-bacterial fabric.Replaceable inner liner pads.Fully adjustable dial sizing system.Quick release chin strap buckle.Adjustable visor for goggles.Designed to accommodate eyewear.This helmet has been constructed, tested and approved in compliance with the European Standard EN 1078:2012+A1:2012. This Helmet also complies with the U.S. CPSC Safety Standard (CPSC 16 CFR 1203) for bicycle helmets for persons Age 5 and older and the Australian/New Zealand Standard AS/NZS 2063:2008.Weight (size M) 370g. Sizes: S (51-55cm)M (55-59cm)L (59-63cm)