The Doffer is waterproof and Flexion engineered to be Hard at Work, Easy on You. Flexion is designed and engineered to work with your body's natural movements. In doing so, Flexion works harder so you don't have to, reducing your daily fatigue. Pull up leather or full grain leather upper. Nylon mesh lining. Open cell PU foam sock liner. PU molded midsole. Rubber outsole. Flexion engineered construction.