Do "True to Size" Running Shoes Always Mean the Same Fit?

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Every running shoe has a size printed on the inside, but that number tells you less than you'd think. Two shoes in the same size, from two different brands, can fit completely differently. If you've ever wondered why that is, the answer usually comes down to shape, not size.

Three runners in Topo Athletic shoes laughing and racing down a winding mountain road

TL;DR

  • A shoe's printed size only measures length, not the shape of the shoe itself.
  • Toe box width and a foot shaped design affect your fit as much as overall length does.
  • A roomy toe box can solve fit problems that sizing up doesn't fix.
  • Understanding design philosophy helps explain why the same size can feel different across brands.

Size Is Only Part of the Story

The size tells you how long a shoe is, but it says almost nothing about its shape. Two shoes in the same size can have completely different overall design. Differences in the toe boxes, insoles, and heel shapes are exactly why the same number can feel snug in one pair and roomy in another brand, according to REI’s Expert Running Shoe Fit Guide.

Two trail runners in Topo Athletic shoes running a ridge trail above a sea of clouds at sunrise

Foot Shape Matters

Feet come in a wide range of shapes and sizes. If you have a wider forefoot or want to give your toes room to splay when you move, you need a shoe built to match that shape, not a longer version of a narrow one. That's part of why people find that running shoes with wide toe box often fit much more comfortably than a conventional shoe, no matter your size.

When Sizing Up Isn't the Answer

Going up a half size can buy you a little extra length, but it won't fix a toe box that's too narrow to begin with. Extra wide toe box shoes solve that problem at the start of the design, giving your toes room to spread out. It’s optimized comfort without sacrificing performance.

Tattooed runner lacing white Topo Athletic shoes with gum soles while sitting on a truck tailgate

What a Foot Shaped Design Actually Changes

A shoe made to mirror the actual shape of a foot allows your toes to align naturally in the toe box. Foot shaped grey sneakers make sense for almost anyone. It’s the perfect way to give your toes the space to do what they are meant to with every step.

About Topo Athletic

Topo Athletic designs performance running shoes with their signature foot shaped fit. It all starts with The Topo Difference: a roomy toe box, secure midfoot and heel, and low heel to toe drop. No matter how you move, Topo Athletic's shoes are made to help you stride for more on the road, the trail, and anywhere your journey takes you.

Find your best-fitting shoe yet from Topo Athletic at https://www.topoathletic.com/

Location: 1 Grant St #150, Framingham, MA 01702, USA

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