Material 97% Bamboo Rayon, 3% Spandex. Everything you love about our soft and snuggly classic footies now with a zipper! Made from our silky smooth bamboo rayon creating a cool outfit in a rainbow of modern, earthy colors. The stretchy material gives you the option to have a snug or looser fit while still staying comfortable and stylish. For those babies starting to walk, we now have grips starting on sizes 6-12 months.