My tall 80 pound 7 year old granddaughter started pedaling her new 2 wheeler wearing these pads. They didn't restrict her movement and the size fit her well. My very small 6 year old grandson wore them for the same purpose. He is 3'10" and 48 pounds. They were big for him but we made it work with the adjustable velcro. He was happy to take them off after our second day of riding because they weren't comfortable, however they accomplished exactly what we wanted- preventing skinned knees and elbows, adding a bit of confidence for the rider and helping parents relax a little. Very pleased with this quality product.