The Danner Tachyon is a boot that acts like a shoe, not a shoe that acts like a boot. Full-Grain Leather & 500 Denier Nylon Upper Known as one of the lightest weight-to-strength materials, 500 Denier nylon combined with premium full-grain leather creates an upper that is as strong as it is lightweight. Polishable ToeThe polishable toe area meets uniform requirements. Waterproof GORE-TEX100% waterproof and breathable, GORE-TEX liners ensure that no water gets in, while allowing sweat and moisture to get out. Unlined for BreathabilityLighter weight with cool comfort in warmer temperatures, this unlined leather boot will mold perfectly to your foot. Speed Lace SystemSpecial hardware allows you to tighten from toe to top with one swift tug for a secure, tight fit. Open Cell Polyurethane FootbedPolyurethane footbed provides superior shock absorption with an additional layer of open cell construction for improved air circulation. EVA MidsoleKnown for its lightweight properties, EVA is a special polymer that provides excellent cushioning. Danner Tachyon Outsole100% rubber for superior abrasion resistance and pentagonal lugs for maximum surface contact. Extended SizesTo accommodate more people, this boot is made this boot in extended sizes. We recommend women select 1.5 to 2 full sizes down for correct fit. How It FitsThe DLE-01 last was designed to be an extension of the foot with superior forefoot and heel capture, stability and a more anatomical shape for comfort. The additional space in the toe box allows the foot to naturally react when bearing a heavy load or changing directions laterally in high intensity environments. 365-Day WarrantyIf you suspect your purchase isn’t up to our unrelenting standards, or is defective in any way, we want to make things right. We offer a 365-day warranty across our entire footwear and apparel lines.