From the ten little website: Description Our Snow Boots are here for your little ones’ winter adventures! Designed with a water resistant upper, waterproof overlays for extra durability and protection, fleece lining and a toggle snow collar, our insulated Snow Boots will keep little feet cozy and dry this season. Featuring our new ultra-traction outsoles and an expandable velcro closure for easy on-and-off, these boots will make the perfect companion for fun in the snow! Materials Upper: Insulated polyester with water resistant membrane and overlays Lining: Fleece Outsole: Ultra-traction TPR