Small / Medium SIze: 52 - 58 cm ABS Tough Outer Shell. Airflow Optimised Venting. Stainless Steel Rivets. Fully Adjustable Straps for Optimum Fit With Easy Secure/Release Clip. Soft EPS Inner Foam Padding. Secure Padded Chin Strap For Comfort. Madd Gear Decals Front and Back. Low Profile and Light Weight Design. Certified Safety Standards.