Altra Torin 9 & Torin ST Review: Zero Drop Gets a Real Upgrade

Written by Lauren Haislip

The Altra Torin 9 is the best version of this shoe Altra has ever made. The new P35X dual-density midsole and Vibram outsole are genuine upgrades.. If you run or walk in zero-drop footwear and want to know whether the 9 is worth switching to, the short answer is yes. If you've been curious about zero-drop but haven't committed, this is the version worth trying first. And if you need a little guidance underfoot alongside the zero-drop geometry, the Altra Torin ST handles that without making the shoe feel like a different animal. Both are available now at =PR= Run & Walk.

What's New in the Altra Torin 9

The Torin 9 makes two changes that matter. Everything else is refinement.

The midsole

Altra replaced the older EGO Max foam with a new material called P35X. It's a dual-density construction: firmer on the outside, softer in the middle. The result is a shoe that feels cushioned without feeling unstable. Previous Torin versions could get mushy or lifeless after a couple hundred miles. The P35X fixes that. The shoe stays energetic longer, and the landing feels more controlled without losing the plushness Altra fans expect.

The dual-density foam also gives the Torin 9 a subtly stable feel without adding any mechanical guidance system, worth noting if you've been comparing neutral vs. stability running shoes and landed somewhere in the middle.

The outsole

Altra brought in Vibram for a road-specific rubber compound called XS Run AW. It's about 20% grippier than the Torin 8 outsole, and Vibram's track record on durability speaks for itself. If you've worn through the bottoms of previous Altra road shoes faster than you'd like, this is the fix you've been waiting for. According to research on running shoe durability, midsole compression and outsole wear are the primary factors affecting shoe lifespan, and both have been meaningfully addressed in the Torin 9.

Everything else? Cleaner heel collar, better tongue construction, same FootShape toe box, same zero-drop platform. The fundamentals are untouched.

Zero Drop and Your Body: What to Expect

Zero-drop sits at the intersection of strong opinions. Some runners swear by it. Others have tried and quietly gone back.

Here's the practical version. A traditional running shoe with 8–12mm of heel drop positions your heel higher than your forefoot. Over time, your calves and Achilles tendons adapt to that position. When you move to zero drop, those tissues work differently, absorbing load they were previously offloading to the shoe's ramp angle.

That's why gradual transition matters. Start with one or two easy runs per week in the Torin 9, keep your other runs in your current shoes, and progressively shift the balance over four to eight weeks. Runners who flip entirely on day one usually end up with sore calves. Take it slow.

For walkers, the transition is gentler. Lower impact demand on the calf means many walkers can make the switch without a formal protocol, though it's still worth listening to your body in the first week.

How It Fits

The Torin 9 runs true to size. The FootShape toe box gives your toes room to spread, that's the whole point with Altra. It's available in standard and wide, and the standard already runs wider than most brands' wide options.

One note: the tongue can be finicky on high-instep feet, folding over and requiring adjustment mid-run. If you've got significant foot volume, try it on in store before committing.

Who Should Run (or Walk) in the Torin 9

Neutral runners wanting zero-drop with real cushion

 This is the shoe's core audience. Easy days, recovery runs, long runs, all-day wear. It's not a speed shoe. It's not trying to be. It's reliable, comfortable, and now more durable than any Torin before it.

Walkers

 The zero-drop platform and wide toe box make the Torin 9 an excellent walking shoe. The P35X foam holds up under prolonged load, and the Vibram outsole performs on varied surfaces. If you're on your feet all day at work, this earns serious consideration, and the =PR= Fit Process can confirm whether the geometry suits how you walk.

Runners curious about zero-drop

If you've been considering the switch, this is the most forgiving entry point Altra has offered. Enough cushion to not feel like a minimalist shoe, enough structure to not feel unstable.

Who should skip it

 Runners who want aggressive energy return or a fast, snappy feel. The P35X is smooth and cushioned, not bouncy. If that trampoline sensation matters to you, there are better options.

The Torin ST: Stability Meets Zero Drop

The Torin ST replaces the Altra Paradigm as the stability version of the Torin line. Zero-drop stability shoes exist on a very short list, this is genuinely uncommon territory.

What makes the ST different from the standard Torin 9 is GuideRail technology: a denser foam section on the inner edge of the midsole that provides subtle guidance for runners who overpronate. It's not aggressive. It doesn't push your foot into position. It nudges. For runners who need mild stability but want natural zero-drop mechanics, the ST hits a niche almost nothing else does.

If you're comparing stability options across brands, the stability running shoes collection at =PR= Run & Walk covers the full range, from mild guidance like the ST to more structured options for significant overpronation.

Who the ST is for: Runners with mild to moderate overpronation who've found conventional stability shoes too stiff or too elevated. Runners transitioning from the Paradigm. Anyone who wants Altra's FootShape toe box and zero-drop philosophy with a little help keeping things aligned.

Specs at a Glance

Torin 9 vs. Torin 8: Is the Upgrade Worth It?

Yes. The P35X midsole is noticeably better than the EGO Max. The Vibram outsole is a meaningful durability upgrade. If you're in a pair of Torin 8s with life still in them, ride them out. When it's time to replace, the 9 is the call.

Frequently Asked Questions

Is the Altra Torin 9 good for beginners?

It depends on your footwear history. If you've never worn a zero-drop shoe, a transition period is necessary, start by alternating with your current shoes for four to eight weeks. The browse the footwear collection to compare low-drop transition options alongside the Torin 9 before committing.

What's the difference between the Torin 9 and the Torin ST?

The standard Torin 9 is neutral. The Torin ST adds GuideRail technology for mild stability. Both are zero-drop. The ST is the right choice if you overpronate and want natural running mechanics without giving up all guidance.

Is zero drop better for running?

Not better or worse, different. Zero-drop can reduce knee stress for some runners while increasing calf and Achilles load, which is why transition time matters. A proper gait analysis is the most reliable way to know whether it suits your biomechanics.

How does the Torin 9 feel for walking?

Very comfortable. The wide toe box, flat platform, and cushioned midsole make it a strong all-day walking shoe. Walkers who've dealt with toe crowding in conventional shoes often find the FootShape toe box to be a genuine relief.

Can I use the Torin 9 for long runs?

Yes. Enough cushioning and durability for marathon-distance training at easy to moderate paces. Not a race shoe, a solid long-run trainer.

Does the Torin 9 run true to size?

Generally yes. Runners with high instep or high foot volume should try it on in store to confirm the tongue fit.

Try the Torin 9 at =PR= Run & Walk

Both the Torin 9 and Torin ST are available now at =PR= Run & Walk. Stop by any of our Northern Virginia or Richmond locations, get a 3D foot scan, and run a few steps on the treadmill in them. Zero-drop is a category where you need to feel it to know, and we'll help you figure out which version is right for how you move.