On Running Women's Cloudsurfer Running Shoe Acorn requires 60% less energy to

requires 60% less energy to bend so each step feels easier

Total shaft height 10

Add to that ABZORB midfoot cushioning

Heel Height: 3 1/2"

firm leather by ECCO

On Running Women's Cloudsurfer Running Shoe Acorn requires 60% less energy toCruise the concrete in this ultrasoft road running shoe. With CloudTec Phase cushioning for a smooth ride and seamless heel to toe transition. THIS IS CLOUDTEC PHASE For an adapted and specialized version of our signature CloudTec technology, ON left nothing up to chance. Using Finite Element Analysis (FEA), they simulated how each component of their prototype reacts while running. Using invaluable insights from this method, they created the optimal