This all-terrain hunting boot comes fully insulated with 5mm CR flex-foam, which provides warmth and extreme comfort, and features fleece lining for additional warmth. The new Optimal Flex technology of this hunting boot is designed to help overall fit and allows for more aggressive end use. To help with the issues of wear and tear when in rugged and rough conditions, Spandura® has been added to the exterior of the neoprene of this boot for added protection against wear and abrasions.