You'll feel the difference wearing these energizing work boots. Built with energy-converting Wolverine DuraShocks and multiple comfort features, the Tremor work boots are long-lasting, to keep you going at the warehouse, construction site or wherever hard work happens. SPECS & TECH Genuine full-grain leather means extra strength and instant comfort Dri-lex lining wicks away sweat and keeps skin dry and comfortable Four times the shock absorption and stability from removable double density footbed Shock-absorbing, energy-returning Wolverine DuraShocks dual-density PU Outsole Rubber midsole Classic Goodyear welt construction is sturdy and flexible Lightweight nylon shank fights fatigue Backed by Wolverine's 30-day comfort guarantee