●Integrated X-Comfort Zone technology with better stretch 3 hook-and-loop straps ●Easy slip on and breathable for great comfort ●New Ergo Air Stream outsole, Fiberglass injected/ nylon outsole with constant ventilation to reduce fatigue and numbness Breathable and ventilated insole ●SPD and SPD-SL compatible with 2-3 bolt Approximate weight (size 38/1 shoe): 7.6 oz/216 g