To ensure its quality, we put our leather through six different tests before making our selection. Our full-grain leathers are the strongest and most durable form of leather.GORE-TEX (GTX)100% waterproof and breathable, GORE-TEX liners ensure that no water gets in, while allowing sweat and moisture to get out.Three layers of varying density are combined for maximum cushioning and support. The entire footbed is made of open-cell polyurethane for better heat dissipation and air circulation.By combining the shank, lasting board, and midsole into a single unified piece that is molded to match the shape and contours of our boots, we were able to reduce a significant amount of weight from the boot without sacrificing support.