Zipper One Piece - Yellowstone - BambooMountain adventures, bison and bears! Sizes run generous and should last at least 3x as long as traditional sleepers. Wash inside out in cool or warm water and hang dry for best care. Made of 95% bamboo from viscose and 5% spandex. Breathable, thermo regulating, hypoallergenic, and eczema friendly. Sustainable and eco friendly material. ?? Cuffs can fold over feet and hands creating a footie pj with mittens (no mitten hand cuffs for 18 24 month size).