Nylon plate (Speed): flexible, provides propulsion and energy return, forgiving enough for repeated training use.
Carbon plate (Pro): stiffer, more propulsive at sustained effort, but the rigidity makes it less comfortable at easy pace and harder on the legs over repeated training use.
PWRRUN PB foam — Saucony's racing formulation. Both are fast. The difference is in what the plate adds to that foundation.
Technically yes. Practically — the carbon plate creates a stiffer ride that accumulates fatigue faster in the legs. Most runners who own both use the Speed for training and reserve the Pro for race day and key tempo sessions.
| Choose Speed | Choose Pro |
|---|---|
| You want one fast shoe for training and racing | You race marathon or half-marathon |
| You want the Endorphin platform without carbon premium | You already train in the Speed |
| You are new to performance footwear | You understand it is not a training tool |
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Source: Saucony Endorphin Speed and Pro specifications from saucony.com.