Summer moccs are 100%cotton outside and are lined with a thin sweatshirt like material, so it still give little one a little padding without the warmth of fleece. They have elastic around the ankle just like the toddler slippers. All moccs 9-12 months and larger 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!
Sizes for the moccs are as follows ( the inches measurements are heal to toe on the outside sole not the inside where the feet go: