What Our Gearhead(R) Experts Are Saying:"The Endorphin Pro 4 is my go-to for fast runs. The carbon plate and mixed-foam midsole create a super responsive feel, while the integrated tongue and heel liner offer secure, all-day comfort."Crafted for performance, the Endorphin Pro 4 brings high-speed capability and energy return with every stride. Saucony's SPEEDROLL technology and a full carbon plate propel us forward, ensuring efficiency and a fast, smooth feel. Its race-ready fit with lightweight cushioning keeps us comfortable mile after mile, making it an ideal partner for intense race days and long runs alike.