Tech 3 Enduro Waterproof Boots - Black/White - US 9/EU 43Boot upper construction is an innovative, lightweight microfiber material that is flexible and abrasion-resistant, Light microfiber on front and rear bellows provides a more comfortable flex area, Toe box is made of synthetic material for high abrasion resistance, Extended Polyurethane (PU) synthetic gaiter helps seal out water and dirt, Contoured Thermoplastic Polyurethane (TPU) calf guard, TPU higher medial guard, TPU outer lateral ankle guard and TPU heel counter for support and resist