The key to any kids gear is to actually fit kids. Pee Wee Elbow Guards were specifically designed to fit kids and to be easy to put on and take off. Chassis made of vented BIOFOAM. Anti-abrasion outer skinning. Soft, comfortable elastic bands. Easy-on/easy-off hook and loop closures. Size S/M fits riders approx. 3-5 years old. Size M/L fits riders approx. 6-9 years old.. Weighs only .15 lbs per pair.