New comfortable XpressCool lining material keeps your feet cool and dry in warm weather. Spandura added to the exterior of the Neoprene upper for added protection against wear and abrasion. CR Flex-Foam 4mm bootie with four-way stretch nylon. 100% waterproof, light-weight and flexible. Quick-clean rubber overlays. Upper is triple reinforced in the toe area and quadruple reinforced in the heel area. Steel shank for additional arch support.