The ThorogoodRealtree Edge Infinity FD Rubber Boot offers waterproof performance in a classic package. Underneath, the Infinity FD Flex-drive anti-fatigue energy-return system absorbs shock while propelling the wearer forward. A NASA-inspired Solarcore aerogel lining added to the toe cap and bottom of the boot has been tested to retain 50-percent more heat, to provide heat-retaining insulation with minimal bulk. The body of the Infinity FD rubber boot is constructed from a scent-free rubber. With zero break-in, the Infinity FD rubber boot pairs easy mobility with protection from the elements. For more information on these boots, which come complete with an antimicrobial wicking liner, 800 grams of 3M Thinsulate Insulation, and adjustable calf gusset and a composite shank, please visit thorogoodusa.com.