My son wore these only once, and they don't fit, so I'm selling them. Open Air Sneaker. A next-generation sneaker made from two cords and a single sole. This revolutionary and unique hybrid footwear was created after rethinking the shoe-making process from scratch, taking three and a half years from conception to completion. Features: ● High-traction rubber outsole with laser siping for excellent grip. ● Microfiber footbed cover ● Lightweight PU (polyurethane) footbed molded to the shape of the foot, with a microfiber top sheet to prevent slipping and enhance sweat absorption. ● Patented interlocking cord system, with two elastic polyester cords that conform to the foot's movement, providing a superior fit. ● Easy to put on and take off, with a comfortable fit, featuring KEEN's signature bungee laces. ● Microfiber heel back that softly holds the heel. ● The UNEEK original collection uses 3MM recycled PET round cord. ● Available in 0.5cm increments, allowing you to enjoy KEEN's signature comfortable fit. Materials: ● 3MM recycled PET round polyester cord × microfiber upper ● High-rebound PU midsole ● High-traction rubber outsole with laser siping ● Lightweight PU (polyurethane) footbed molded to the shape of the foot ● Uses recycled PET