To ensure its quality, they put their leather through six different tests before making their selection. Full-grain leathers are the strongest and most durable form of leather. 100% waterproof and breathable, GORE-TEX liners ensure that no water gets in, while allowing sweat and moisture to get out. Hyper-strong thread is used to triple stitch our toughest boots. Electrical hazard (EH) footwear is manufactured with non-conductive electrical shock resistant soles and heels. 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.