F-35 BLACK - Upper: lightweight synthetic leather with strong ventilated nylon mesh. - Sole technology: lightweight, injected with fiberglass reinforced polyamide, sole delivers a stiff, powerful and efficient pedal stroke. With a vent port at the front for effective cooling for your feet. - Fastener: 3 Velro straps. - Footbed: Breathable and removable. - Cleat compatibility: C-20, C-30 series and 3-bolts systems. - Vented Tongue for breathability - Heel: Multi-layered heel support for maximum comfort and stability.