Used once by my 5 year old, December 23, 2018 for 1 hour to sit outside a cabin. Size 11M (US little kids) The spring-locking buckle is designed for children's adjustment,snug and close-fitting;Convenient hook and loop keep a comfort fit while sealing in warmth convenient for the baby to wear off. The shoes are filled with a large amount of artificial fluff,which is to increase the warmth of the shoes. The round toe with waterproof and lightweight rubber shell and outsole to keep your boys or girls feet warm and comfortable in cold weather conditions;Artificial materials and rubber materials make the upper waterproof,and children can play outdoors without wet socks. The sole and its joint are specially designed to prevent the child from falling off while increasing the friction between the shoes and the ground.