Zipadeedoodah! Kickee Pants' signature Footie now comes with the option of a zipper! Easy on and off. Just perfect for those middle of the night changes. Their sweet footies features flip paws to cover cold hands and prevent scratching. The inside of the foot is lined with super soft fleece and the bottoms feature grips to prevent slipping. Sizes Preemie through 6-9 are their Classic (relaxed) fit. Sizes 9-12 and up are snug fitting. They recommend trying on before washing. Features: Breathable, buttery-soft Bamboo fabric (95% Viscose from Bamboo, 5% Spandex) Machine washable Hypoallergenic Federal regulations require sleepwear not treated with flame retardants to be snug fitting. Now rated UPF 50+!