Super Safety Green/Black Bike Helmet Cool Ultralight Adult Road Mountain Bike Cycling Helmet 56-63cm Head Circumference with Detachable Green Visor MATERIAL REDUCE HEAD BUTTING INJURY - PC shell, EPS inner shell-Shock absorbing EPS inner liner for added protection. ADJUSTABLE - head circumference is 56-63cm.This adult cycling helmet goes with a standard size, equipped with the easy-use dial system and side straps make this nutcase helmet adjustable to different head size and suitable for both men and women. BREATHABLE - 18 flow vents to keep you cool. Inner back sweat-absorption padded keep you dry. PACKING - 1 x Helmet