Bowbear Adorable Designs Baby Leg Warmers, Pig and Stripes Protect babys knees when crawling and from exposure to cold, sun, and insects. Also keeps little legs warm during diaper changing. Can be worn on the legs or arms. Size: Approximately 12 inches long. Can be worn on entire leg for babies and up to the mid-thigh or knees for toddlers. Made out of cotton, spandex, polyester.