Tech 3 Boots - Gray/Black - US 11Upper construction is made from innovative and light microfiber material that is flexible and abrasion resistant, Light microfiber on front and rear bellow gives more comfort on the flexible area, Toe box is made of synthetic material for high abrasion, Extended Polyurethane (PU) synthetic gaiter helps seal out excessive water and dirt entry, Contoured Thermoplastic Polyurethane (TPU) calf protector plate, TPU higher medial protector, TPU outer lateral ankle and TPU heel counter offer support and resistance to i