V-Share Cycling MTB Road Bicycle Helmet 18 Holes Riding Equipment Male And Female Models(Adjustable limit:56~62cm Please confirm before buying the products) Dial Fit adjustable system adds ease,with a flashlight in the helmet's tail Ultra-light, wind tunnel, duct design, effectively reduce wind resistance. High-quality foam layer, the adjustment within the twist, you can adjust the size of head circumference. Suitable for people with head circumference 56-62cm and the head-width below 17.5cm. 18 flow vents to keep you cool with snap on/off visor for sun protection