Full-Grain Polishable Leather & 1000 Denier Nylon UpperTo reduce the weight of the boot, we combine our smooth, full-grain leather with incredibly strong 1000 Denier nylon. This durable upper is completely polishable.GORE-TEX (GTX)100% waterproof and breathable, GORE-TEX liners ensure that no water gets in, while allowing sweat and moisture to get out.Vibram® Kletterlift OutsoleSpecifically designed for comfort and durability; the heel provides superb shock absorption and the rubber compound guarantees great traction and stability on both wet and dry surfaces. This classic Kletterlift outsole is oil- and slip-resistant with low lugs for urban environments. It also features the Vibram TC4T compound for added durability.Stitchdown ConstructionHandcrafted to provide a wider platform, our legendary stitchdown construction offers increased stability underfoot. Many of our stitchdown boots can be recrafted.How It FitsThe 650 last offers a sleek, slender profile with a more narrow fit. Boots on this last tend to fit those with a more narrow foot better than those with a wider foot. This ensures a snug fit for terrain and activities that demand support and stability. If you do have a wider foot, we recommend ordering an "EE" (wide) in this style. Please note this last fits slightly long and we recommend sizing down a half size for best fit.RecraftableExtend the life of your boot with our recrafting services. This boot is eligible for a number of paid services, including part replacement, leather care and restitching.uck Leather UpperOur top-grain leather is sanded on the outside to give it a slight nap with a velvet-like feel. This leather upper is extremely durable, while offering a shorter and more comfortable break-in period.GORE-TEX (GTX)100% waterproof and breathable, GORE-TEX liners ensure that no water gets in, while allowing sweat and moisture to get out.Triple StitchedHyper-strong thread is used to triple stitch our toughest boots.400G Thinsulate Ultra InsulationHigh-performance insulation that keeps you warm in the snow and rain without weighing you down.Electrical Hazard (EH) ProtectionElectrical hazard (EH) footwear is manufactured with non-conductive electrical shock resistant soles and heels.Composite Toe (NMT)Our composite toe is non-metallic, does not transmit heat or cold, nor will it set off metal detectors. As expected, it meets or exceeds ASTM F2413-18 M I/75 C/75 EH standards.Quarry MidsoleUpgraded the midsole to a single, solid piece for increased longevityVibram® Quarry Fire & Ice OutsoleFor superior traction in extreme cold and hot environments, this exclusive outsole features a 90º heel, an oil- and slip- resistant rubber compound, and a non-linear lug pattern for superior traction and debris release.Stitchdown ConstructionHandcrafted to provide a wider platform, our legendary stitchdown construction offers increased stability underfoot. Many of our stitchdown boots can be recrafted.How It FitsThe 610 is our most universal last and can be worn by all foot shapes and sizes. It provides a snug fit through the heel while allowing ample toe room for most versatile fit. This allows more support and side-to-side movement.RecraftableExtend the life of your boot with our recrafting services. This boot is eligible for a number of paid services, including part replacement, leather care and restitching. Please contact us If you are UNSURE of your size. All style fits slightly different.