With an elastic T-strap band, the Moxy is easy to put on and take off while remaining snug to your child's foot. Each shoe is lined with cotton to keep the foot dry and warm. Sizes 4 and up come with a hard sole for any new walking child. To ensure ordering a proper size, please measure your child’s foot prior to ordering. We recommend adding 1/2″ to your child’s foot measurement for growing room.