Lace ‘em or chase ‘em. It’s speed over everything when you lace up the Endorphin Pro 3. Designed with a carbon-fiber plate and an even thicker stack of PWRRUNPB foam cushioning, you get more pop underfoot for the ultimate go-fast experience. FEATURES & BENEFITS -Max stack PWRRUNPB, an elite-level technology best known for its responsiveness, meaning it quickly returns energy to the runner with each footstrike -S-curve carbon-fiber plate designed to facilitate a more efficient energy transfer from heel strike to toe-off, giving a spring effect to every step -SPEEDROLL Technology encourages a smoother and easier run by helping you roll from heel to toe with less effort so you can faster, not harder -FORMFIT design hugs every part of your foot while allowing full natural movement for a personalized fit -XT-900 rubber for durability and traction, gripping the road to keep you moving forward -Suitable for racing, tempo running or interval training, road running, and various types of fast running Original owner, excellent condition and only worn on treadmill a couple times