Saucony Endorphin Pro 4: A 100-Mile Review of Saucony's Maximalist Super Racing Shoe

Introduction

The Saucony Endorphin Pro 4 is Saucony’s maximalist super racing shoe, built around a carbon fiber plate with a full-length layer of PWRRUN PB foam over an internal layer of PWRRUN HG. It has been a top racing shoe for the brand across several generations, and this version continues that lineage while changing the character of the ride in some interesting ways.

After 100 miles of testing, one thing became clear: this is a shoe with a split personality. Some of its traits point toward longer-distance racing, while others clearly favor shorter, faster efforts. Here is how it all shakes out.

Specs

In a men’s size 10, the Endorphin Pro 4 weighs about 8.1 oz, or roughly 228 g on the scale. The stack measures 40 mm in the heel and 32 mm in the forefoot for an 8 mm drop, which feels fairly accurate, though the ride can feel a touch lower as the foam compresses.

Durability After 100 Miles

Durability is the biggest question most people have about this shoe, and after 100 miles the answer is encouraging. The outsole has not worn through, and there has been no need to retire the shoe.

That resilience is a big part of why it keeps getting picked for workouts rather than being saved only for race day. If you want a super shoe that can handle a lot of miles and a variety of sessions, this one is on track to deliver real value in terms of miles per dollar.

The Ride: Long Efforts vs Short, Fast Work

Out of the box, the forefoot feels very stiff, and that shapes the entire ride. The heel is soft and bouncy, with plenty of bounce and resilience underfoot, which makes longer uptempo efforts and long runs feel genuinely good. For marathon-pace work and moderate-to-uptempo paces, it is forgiving and comfortable without feeling sluggish.

The tricky zone is 10K to half marathon pace. The soft heel transitions nicely on the lateral side, but the stiff forefoot plate makes it harder to get a clean transition at that middle tempo range. It stays comfortable, it just does not snap through the stride as readily at those paces.

At faster paces, the story flips. On the track at 5K effort and quicker, the stiff forefoot shines, delivering a snappy pivot for forefoot strikers who push hard off the toe. Runners who like a firmer, more aggressive toe-off will feel right at home here, and the shoe rewards speed with speed.

Stability: A Surprisingly Stable Neutral Racer

The Endorphin Pro 4 is one of the more stable neutral shoes in the racing category, even with its softer ride. The sidewalls are tall through the midfoot and continue into the forefoot, and the filled-in, wide forefoot adds a lot of midfoot and forefoot security, helped along by the stiff plate.

There are small slits in the lateral midfoot that allow a controlled compression, which aids transition but does mean the heel leans on the softer side. Runners with some lateral heel instability may want to look elsewhere, while those needing a bit of medial guidance at the heel will appreciate how this shoe is set up. Across long runs, the stability never became a distraction, which is the surest sign it works.

Fit and Upper: Room to Spare

This is where the shoe breaks from racing shoe convention. Most super shoes fit snug and low volume, but the Endorphin Pro 4 uses a one-piece upper without a separate tongue, and it fits fairly high in volume throughout, especially in the midfoot and forefoot, with more height and width than typical. The heel is fairly normal to slightly snug.

For runners who just want a bit more room, particularly a little extra height, this is one of the better options on the market. Runners with normal or lower volume feet will need to cinch the laces down hard, and because the tongue is very thin, it can compress and require some finesse to get a secure fit.

Buying Advice

If you race 5Ks and 10Ks, push hard off the forefoot, or simply want a fast shoe that is friendly to daily training and marathon workouts, the Endorphin Pro 4 makes a strong case. It also suits runners with higher volume feet who usually struggle with racing shoe fit.

If you are chasing a more aggressive feel for 10K and half marathon racing specifically, the softer heel and stiffer forefoot combination may not transition as smoothly as you would like at those paces, and the added weight makes it slightly less aggressive than the previous version, which some runners may still prefer.

Conclusion

After 100 miles, the Saucony Endorphin Pro 4 proves itself as a durable, forgiving, and genuinely fast super shoe that handles long uptempo efforts and short, hard intervals especially well. Its split personality is the main thing to understand before buying: brilliant at the extremes of pace, a little awkward in the middle, and unusually accommodating up top. Match that character to your racing and training, and it is easy to get your money’s worth.