Geox Trekkyup winter boots have a warm polyester lining and an upper made of polyurethane, woven polyester and synthetic rubber. The reinforced toe and heel protect when playing in the snow. The waterproof and breathable Amphibiox™ technology helps keep feet dry, while Respira™ technology promotes moisture wicking. The Velcro fastening makes it easy to put on and the removable insole makes maintenance easy.