The Zoot Ultra Speed 2.0 Triathlon Running Shoes feature CarbonSpan+ allowing you to be lighter, stronger, and faster. Offering tunable control that maximizes a smooth, powerful “toe off” for effortless forward momentum without forefoot fatigue. The Z-Bound Layer provides better cushioning. Over the long haul, the super-light properties of a Z-Bound midsole rebounds a runner’s energy, reducing stress and fatigue. Also featuring a 17mm/7mm differential to keep your foot close to the ground, with a layer of ZVA between you and the road for a smooth ride. The super-light properties of the Z-Bound midsole rebounds your energy, to reduce stress and fatigue.