Shoe Shank Explained

In brief: The shank is a stiffening element in the midfoot of a shoe that controls torsional flex, supports the arch and stops the shoe twisting too much.

What is a shank?

The shank is a firm insert built into the midfoot, between the midsole layers under the arch. It can be plastic, composite or a moulded shape in the foam. Its role is to control how much the shoe bends and twists through the middle, bridging the gap between the cushioned heel and the flexible forefoot.

What it does

The shank resists torsion, the twisting of the shoe along its length, and supports the arch. This gives the midfoot stability so the shoe does not collapse or wring out under load. On trail shoes a shank also protects the arch from sharp rocks and adds the rigidity needed on uneven ground. Road shoes use lighter shanks or shaped foam for a similar effect.

Types and variations

Shanks range from full plastic plates to small composite bridges or simply a firmer section of midsole. Stability and trail shoes use more substantial shanks; flexible and minimal shoes use little or none. A carbon or nylon propulsion plate can also serve a shank-like stiffening role.

What to look for

If you want midfoot support and a shoe that does not twist easily, look for a defined shank. You can test torsion by gently trying to wring a shoe along its length: a firm shank resists. Runners who want maximum flexibility and ground feel prefer less shank.

The shank and your running kit at OD's

Midfoot stiffness is a key part of how supportive a shoe feels. We can help you compare across our range, with next-day delivery and free click and collect.