Polar Express Convertible RomperMade from ultra soft sustainable bamboo viscose (95% viscose, 5% spandex) Functional crescent two way zipper for easy on and off and quick diaper changes Convertible foot flap to switch between footie and footless styles Fold over hand mittens included on all sizes True to size to comply with CPSC safety regulations Bamboo is not chemically treated Machine wash cold with like colors Sizing runs true to size; when in doubt, size up Accessories sold