The Endorphin Speed uses PWRRUN PB foam — Saucony's racing formulation — with a nylon plate. The nylon plate provides stiffness and propulsion without the full rigidity of carbon. The result is a shoe that feels significantly faster and more responsive than a daily trainer, but has enough compliance that many runners use it for quality training sessions as well as racing.
PWRRUN PB is Saucony's most energetic foam formulation. In runner testing and specialist reviews, it has been consistently described as one of the most responsive foams in running. The Endorphin Speed exists primarily to deliver this foam at accessible pricing.
Runners doing weekly tempo runs who want a responsive shoe. Half-marathon and marathon runners looking for a race-day shoe that does not require a second mortgage. Runners who want to experience what a performance shoe feels like.
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Source: Saucony Endorphin Speed specifications from saucony.com.