Toddler slippers are 100%cotton outside and fleece lined, they have elastic on the inside keeping your little ones from getting them off!!! All toddler slippers have non slip on them called ToughTek. It is a rubber waterproof material and they are 100% machine washable! They do run small so I would suggest going up a size! Toddler slippers start at shoe size 7/8 and go up to 13.