Gravis - Merc BB FW '04 (Black Full Grain) - Men's: Slide-in comfort with excellent traction, the Merc has set a standard in anatomical open-toed sports footwear. Part of the limited edition Black Box Collection. Mesh lining for superior comfort. EVA deck and midsole. No-pinch anatomic strap. Footbed gutters drain moisture. Critical zone sole, integrated heel cradle, and full arch support. These sandals are a must for endless summers.