Crawlings knee pads are recommended for ages 6 months to 4 years+, from crawlers to toddlers. They are great for indoor and outdoor use. Made of 80% premium cotton, 10% EVA foam, 5% nylon, and 5% spandex, the body of the knee pad is soft, stretchable and comfortable like a sock to move and grow with the child. The center of the knee pad is made of a lightweight foam cushion that is soft, flexible, water and UV resistant. The cushion helps to reduce the impact to their tender knees and to protect their skin from bumps, bruises and scratches. The back of their knees will have ample ventilation and comfort with the vented design. All materials used are colorfast and machine washable in cold water, tumble dry on low heat or air dry. No bleach.