BIAL-otd Cycling Safety Head Protect Helmet Super Lightweight Integrally Road Bicycle Cycling Helmet Weight: 7.8oz EPS foam and 18 vents allow cool air in and warm air out rotary conditioning system more convenient to adjust the tightness of the helmet using one-piece construction and smooth tail lines not only stylish more to reduce wind resistance designed to strengthen the brim made.can effectively avoid free foreign objects flying into the eyes of the rider but since to a certain shade effect