Shoe Review: Saucony Peregrine 10

A person running in the Saucony Peregrine 10 trail running shoe

The Saucony Peregrine 10 maintains the confident ride of the previous model with upgraded everything else for the new decade.

Saucony ditched the ISOFIT system they used in the Peregrine ISO and returned to the numbered naming convention used in earlier models. The Peregrine 10 now employs a more straightforward FORMFIT technology that makes for a comfortable fit.

Even though Saucony updated the fit, the Peregrine has the same sticky, aggressive outsole that gives the shoe top-notch traction runners demand from their trail running shoes.

Fleet Feet runners tested the newest edition of the Peregrine to check the grip, feel the ride and see how the updates change the fit. Here’s what they found.

Tech specs

Saucony Peregrine 10




9.3 oz (women’s); 10.7 oz (men’s)


4 mm (27 stack height in heel, 23 forefoot)


5 mm lug depth





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Saucony Peregrine 10 Fit and Materials

A runner holds a pair of muddy Saucony Peregrine 10 trail running shoe

Running on garnly trails can tear up a pair of running shoes, so Saucony reinforced the Peregrine 10 with an abrasion-resistant upper and other durability features.

There’s a hardy engineered mesh upper and additional overlays that wrap all the way around the heel for nearly 360 degrees of second-layer protection. The Saucony logo even bolsters a midfoot overlay to prevent excessive wear.

Despite all of this, the Peregrine breathes surprisingly well. The mesh weave is tight enough to keep dirt and debris from slipping through but airy enough to let sweat and water out.

The switch to the FORMFIT system is a change from the previous Peregrine’s ISOFIT system. Where ISOFIT used independent, finger-like straps to dial in the fit of the upper, Saucony says FORMFIT is created by three layers of foam beneath the foot:

  • A top layer that conforms to the unique shape of your foot
  • A middle layer of EVERUN foam that adapts to different pressure
  • A reactive bottom layer that’s contoured to the natural shape of your foot

Together, Saucony says the layers work together to give you a fit that molds to your foot.

Fleet Feet testers say the FORMFIT system creates a seamless feel and comfortable footbed.

“It all works together so well,” one tester says. “I haven’t encountered any pain points in the Peregrine.”

The new shoe incorporates a straightforward lacing system with five eyelets on each side of the shoe. An added loop of fabric across the tongue helps lock in the midfoot fit.

Two other stand-out features are the lace strap and D-ring. The small lace strap runs across the tongue right over the midfoot to give you a place to stuff the laces so they don’t bounce around, snag on branches or come untied during a run; the small D-ring gives you a way to secure a gaiter to the shoe.

Saucony Peregrine 10 Ride and Performance

A runner on a trail wearing the men's Saucony Peregrine 10 trail running shoes

The newest Peregrine is a cushy and smooth-riding trail running shoe that inspires confidence thanks to an aggressive outsole that help you stay upright on a slick trail.

The 5 mm lugs are deep enough to bite into loose terrain, and the arrowpoint pattern—facing forward in the forefoot and rearward in the heel—gives the shoe purchase whether you’re going uphill or downhill.

Some trail running shoes can pick up and carry mud because the lugs are too tightly packed, but testers say the latest Peregrine has the right spacing.

“It really gave me great traction in the mud without holding onto the mud,” one tester says. “This Peregrine worked even better for me than the previous models.”

For anyone who needs even more grip, though, Saucony created guides to let runners add extra cleats to the outsole. The outsole is mapped to give you places to drill into the shoe to add studs—especially helpful if there’s a lot of snow and ice on the ground.

A rock plate in the forefoot provides solid protection against jagged rocks or roots, and drainage ports let water seep out quickly after stream crossings or rain.

​Saucony Peregrine ISO vs. Saucony Peregrine 10

A side-by-side comparison of the Saucony Peregrin ISO and the Saucony Peregrine 10

The move away from ISOFIT sent the Peregrine back to the numbered models Saucony used before, so the Peregrine 10 falls in line right after the Peregrine ISO.

The big change to the Peregrine is the switch to FORMFIT. But Saucony updated other aspects of the shoe, too.

Saucony swapped out the PWRFOAM midsole for a new PWRRUN foam to give the new model a more responsive ride, and the added rock plate gives this year’s Peregrine more protection against rugged trails. The 10 also has a little more cushion underneath, increasing the stack height to 27 mm in the heel and 23 mm in the forefoot.

Both the Peregrine ISO and the Peregrine 10 use the same sticky PWRTRAC rubber, but designers this year redesigned the lug pattern. The ISO relied on relatively uniform rows of lugs that ran from heel to toe, but the 10 altered the sizes, placements and shapes of the lugs: The Peregrine 10 uses larger and smaller arrows arranged neatly across the shoe.

The uppers look fairly similar, sporting only minor tweaks to the size of the Saucony logo and the different overlays.

Tech comparison

Saucony Peregrine ISO

Saucony Peregrine 10


9.2 oz (W), 10.5 oz (M)

9.3 oz (W), 10.7 oz (M)


4 mm

4 mm

Fit system



Outsole rubber



Stack height

22.5mm/18.5mm (heel/toe)

27mm/23mm (heel/toe)


The new Saucony Peregrine 10 is a bomber trail shoe that begs for a spot in your regular shoe rotation.

Aggressive, sticky outsole lugs give the Peregrine plenty of traction on all types of off road terrain, and the cushy PWRRUN midsole is easy on your feet. The updates to the upper and FORMFIT create a stellar running shoe that we think will work well in a variety of conditions.

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Still not convinced? Don’t sweat it. Fleet Feet's return policy means you can test drive your shoes and gear without risk. If you’re not happy with the way your gear performs, looks or fits, we’ll take it back within 60 days. Plus, you’ll get free return shipping on all orders. That's our Happy Fit Guarantee.

By Evan Matsumoto. Evan played many sports growing up but didn’t go pro in any of them. Now, he’s the digital copywriter for and editor for the Fleet Feet blog where he writes about different foam densities and engineered mesh uppers.

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