New and Improved! We didn't think it could any better, but Rugged Shark has added a kicker on the back of the boot so it may be removed effortlessly. They have also used a new material for the upper stock the comes with a one year crack-proof and waterproof guarantee and still provides excellent flexibility. Features removable water friendly footbed, and Shark Gripâ„¢ slip resistant, non-marking rubber outsole. Available in whole sizes: 8 - 13.