The Endorphin Elite 2 upgrades the foam, but keeps a lot of things the same, using the same slotted carbon fibre plate, aggressive speed roll technology, stack height and fit that all worked so well in the original. It does upgrade the outsole, with foam coverage through the footstrike path, added rubber coverage in the heel, and PWRTRAC rubber used for improved wet weather traction. A brand new Ultra lite mesh is enhanced with a knit tongue and seamless 3D heel build so you get the locked in fit you need in a lightweight, breathable upper.