Shorven Boys Girls Pajamas Costume Animal Hoodie Onesies Flannel(100% polyester) Button&Zipper closure About the size: The height in size name is the reference height of the kids, not the length of the onesie. And better to measure the kids' height before order, if you kids' height close to the limit, please choose one size bigger. Fine flannel material:soft and keep warm. Button on front:easy to take off;zipper on back:easy to go to the toilet. Please refer to more size info in product descriptions below. Machine washable,flat dry.