Troy Lee Designs Galaxy A1 Bike Sports BMX Helmet - Matte Blue/Medium/Large Reinforced polycarbonate shell in-molded with the EPS liner extends down the sides and back of the head for maximum durability 8 pressurized intake passages draw in cool air for maximum ventilation 8 rear vacuum vortex outlets help exhaust and draw heat from head Triple position adjustable retention system allows customized fit for various eyewear, head shape and riding styles 2015 Model