Matrix is waterproof, fits your foot and protects it at its best. With DPI certification. Upper: full grain writer leather. Lining: waterproof and breathable. Malleolus Protections: malleolus on both sides + tibia + calf bone. Protections: leather gear protection. Fastening: two self-blocking adjustable levers + velcro. Footbed: anatomic and changeable. Sole: Vibram anti-slip, rubber stone. Size: 39/47.