Adult Road Cycling Helmet and Mountain Bike Helmet with Visor Cycling Pc EPS Protecting Vented Design Lightweight MTB Helmet Pad Adjustable Size - Red Material: PC shell(more durable than PVC), EPS inner shell-Shock absorbing EPS inner liner for added protection Fits most adults (58 - 61cm/ 22.8 - 24 inches Head Circumference), Dial-fit retention system can adjust the size of head circumference. Vented design - 16 air vents for maximum comfort. Lightweight design, weighs only 240g. Quick release. Detachable helmet visor, make it to be both a Mountain Bike Helmet and a Road Cycling Helmet. Removable padding, convenient for cleaning. Complies with all U.S. Safety Standards for Bicycle Helmets