Wicked cool and unique, Keen's Uneek Sandals feature two cord construction for a free moving fit that adapts to the shape of your foot. Razor siping ensures confident wetdry traction, and the PU midsole provides durable comfort underfoot.. . Two cords and free moving cord junction design allow upper to move and adapt to the shape of your foot. Design allows freedom of movement with security and structure. 8mm polyester braided and nylon cords for increased strength. Nonmarking high traction rubber outsole with razor siping for secure footing on wet or dry surfaces. Lightweight PU midsole for durable cushioning, support, and stability. Metatomical footbed provides excellent arch support and cradles the natural contours of the foot. Microfiber footbed cover for comfort. Lace capture system with bungee elastic and cord lock provides a secure fit. Keen.Protect outsole reinforcements safeguard against abrasion and mild impact, to help keep toes safe. Keen finds this style runs about a 12 size small and suggests ordering 12 size larger than your usual size.