RSG 3-Pack Anti-Skid Gripper Slipper Socks for Kids/Kids Ages 6-12 One Size Fits Most. Fits most kids ages 6-12. Depending on shoe size they will fit longer or shorter toward the ankle. This will also determine the grip coverage on the bottom of the foot. Skid resistant sole 80% Acrylic - 20% Nylon Tube style, no formed heel.