Footie is made of 95% Viscose from Bamboo, 5% Spandex. Zipper makes for easy on and off and middle of the night changes. Featuring flip paws to cover cold hands and prevent scratching. The inside of each foot is lined with soft fleece and the outside bottom is embroidered to prevent slipping. SPF 50+. KicKee Pants uses only source bamboo that is grown organically from manufacturers that provide Harmful Chemical Free Assurance.