You gotta crawl before you can walk or even think about playing sports, and these knee pads will protect any future hall-of-famer's tiny knees as they scurry across the floor, climb up steps or jungle gyms. Unlike conventional knee pads, these are constructed like a sock, allowing the pads to be pulled on or off with ease. No scratchy Velcro here, Crawlings are made of cotton with a touch of spandex for stretch and comfort. The center of the knee pad is a light weight EVA foam -- the same material found in sneakers -- to help reduce impact to soft knees and protect skin from bumps, bruises and scrapes. The EVA foam is soft and flexible, and its low profile will not hinder movement or play. Plus, it's UV, water and mildew resistant. The back of their knees will have plenty of ventilation provided by the mesh fabrication design. Babies can begin wearing the pads around 6 months, and they are designed to adapt for use for active toddlers up to 2 years. All materials used are colorfast and machine washable in cold water. Air dry or tumble dry in low heat. No bleach. Comes in Baseball, Basketball and Soccer. Measure 3" x 5.5".