Be race day ready in the Saucony Endorphin Pro 4. Experience a snappy on-your-toes feel thanks to Speedroll technology which provides effortless speed and an addictive forward motion feel. Saucony's trusted Carbon Fibre Plate is sandwiched between the energy efficient PWRRUN HG and ultra responsive PWRRUN PB for an insanely smooth heel-to-toe transition. The ultimate race-ready design, Saucony has re-engineered their upper and added a silky smooth heel-liner alongside a integrated tongue to achieve a connected, secure fit. Try not to bounce in Saucony's all new Super Responsive Sockliner.