Material: pure cotton, 80% cotton, 20% spandex, made of high-quality fabrics, with good water absorption.Size: about 13*9CM.The use of knee pads: to protect the tender skin when crawling, and not to be afraid of cold legs when changing diapers. Protect young fat legs from abrasions while playing. Protect your baby's calves from UV rays. Don't be afraid that your baby will catch a cold when sleeping, going in and out of air-conditioned places. In addition to being worn on the legs and arms, it is also applicable.Color: Green, Pink, Gray, Brown, BluePackage includes: 5 pairs of knee pads (one pair in one color).