What a great idea! Protect soft knees from harsh surfaces, keep legs warm year round while making diaper changes and potty training easier by not having to take off the tights!! Feet remain free to allow for successful crawling, walking and dancing. They also help keep socks on! Fit most newborn-10 years! Babylegs are fun to use as arm warmers too! Babylegs a very soft blend of 80% cotton, 15% polyester, 5% spandex.