Design: Full-grain leather calcio boots, ultra-soft yet water-resistant Anti-stretch fabric lining and anti-slip PU back lining Sockliner with flex points in the forefoot area Durability & Traction: Polyurethane of differentiated hardness with 12 fixed lamellar studs Flex Rotax is the innovative stud arrangement system designed to give the forefoot maximum traction and release from the ground while providing perfect stability for the heel Engineered to deliver peak performance on natural grass or firm ground surfaces