Sidi X-Treme boots are designed with maximum protection, comfort and rigourous off-road performance in mind. This version has interchangeable outer soles. Features: - Made mainly of Techno Micro, a durable, lightweight, quick- drying, synthetic fibre. - Anti-slip, replaceable rubber sole for excellent brake feel. - Nylon inner sole. - Removable arch support. - Internal plastic guard with ergonomic foam padding for enhanced protection. - Anatomically shaped heel for maximum protection. - Replaceable, adjustable buckle system with memory straps. - Cambrelle® lining for increased breathability and comfort.