F-15 BLACK - Upper: lightweight synthtic 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: 2 velcro straps with ratchting buckle - Footbed: removable, dual density. - Cleat compatible with C-20, C-30 and 3 bolts systems. - Heel: Multi-layered heel support for maximum comfort and stability.