Designed for getting into fun fast, the Flex Runner 4 is easy to pull on. Its bootie-like design is flexible with stretchy straps that secure kids' fit. Flex grooves in the outsole allow little feet to move naturally, helping kiddos find their footing. Design Elastic straps run behind the heel and across the top of the foot to give kids a snug, secure feel Pull tabs on the heel and tongue work with a stretchy inner sleeve to help make these shoes easy to put on In-Shoe Comfort Soft, springy foam in the midsole helps cushion their every step Durability & Traction Multisurface traction works with sturdy foam that wraps around the heel to provide grip and stability when kids shift directions Flex grooves in the outsole add flexibility, helping every step feel natural Reinforced toe box and durable materials throughout help these kicks stand up to how kids play