Dupont Thermolite Membrane waterproof lining maintains a dry, healthy foot environment. Tempered steel shank offers added support and keeps your arch pressure free. Extended medial heel stabilizer provides superior support and minimizes heel slippage. Leather or nubuck upper, AEGIS Microbe Shield upper lining, polyurethane insole... Care: Leather: Buff with leather cleaner. Wipe with cloth. Nubuck: brush with soft brush, etc.