Feast your eyes on this first look at the saucony Endorphin Pro 4, the latest race day option from Saucony. The update brings a snappy on-your-toes feel thanks to its Speedroll technology, trusty carbon plate and new sockliner made with a bit of bouncy foam they’re calling an SRS (Super Responsive Sockliner!) Available March 1st. #saucony #runningshoes #endorphinpro #fleetfeet