Saucony Endorphin Speed 4

Saucony Endorphin Speed 4 review: what runners say

Fit

True to size with a narrow toe box; half size up recommended for wide feet. Revised upper in v4 offers a compromise between the plushness of v3 and the snugness of v2.

Feel

Reactive, balanced ride thanks to PWRRUN PB and nylon plate; firmer than v3, with Speedroll geometry that promotes smooth transitions. Some runners note a lack of energy return compared to competing foams like FuelCell or ProFlyX.

Durability

Estimated 500–600 km for runners under 165 lbs. XT-900 outsole is well-constructed; the exposed midsole zone in the center tends to wear faster for heel strikers.

Best for

Versatile trainer for paces in the 6:30–8:00 min/mile range: intervals, quality sessions, long runs up to ~18 miles. Suitable for races up to the half marathon; not recommended for runners seeking carbon-plate propulsion or maximum cushioning for ultras.

Weak points

Nylon plate too flexible for those seeking propulsion assistance on par with the Endorphin Pro. Full retail price considered high relative to competitors with comparable features.

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