Shoe Shank: What the Midfoot Support Plate Does

What is a shoe shank

A shoe shank is a rigid insert placed under the arch, between the outsole and the midsole. It spans the midfoot, connecting the heel and the forefoot. The shank is what gives a shoe its torsional stiffness, meaning the resistance to twisting along its length. If you grip a shoe with two hands and twist opposite ends, the shank is the part that resists that motion.

Shanks exist in many types of footwear, not just sneakers. Traditional leather dress shoes often use a steel shank to keep the sole rigid under the arch. Hiking boots, work boots, and some basketball shoes also include shanks. In sneakers, the shank is sometimes called a midfoot shank, a torsion shank, or a support plate, and it can be made from nylon, TPU, or carbon fiber.

Why torsional stiffness matters

The midfoot does not bear weight the way the heel and forefoot do. When you walk or run, your foot moves through a cycle of pronation (rolling inward) and supination (rolling outward). During these motions, the shoe twists slightly. A shoe without a shank relies entirely on the foam midsole and upper to resist that twist, which can allow the foot to roll excessively or cause the shoe to fold unevenly.

Torsional stiffness matters most in activities that involve quick changes of direction, uneven terrain, or heavy loads. Court sports, trail running, and hiking demand a stable platform. In contrast, a flexible shoe without a shank allows the foot to move more naturally and can be more comfortable for casual walking, especially if you have flat feet or prefer a more minimal feel. The tradeoff is a loss of stability under load.

For context, the American Academy of Orthopaedic Surgeons publishes patient education on foot and ankle conditions through OrthoInfo, which emphasizes that supportive footwear can help manage conditions like flatfoot and plantar fasciitis. A shank is one of the structural features that provides that support, though you should consider it together with the heel counter, arch support, and midsole firmness.

Types of shanks

Shanks are made from several materials, each with different stiffness and weight characteristics.

Steel shanks are the stiffest and most durable. They appear in work boots, hiking boots, and many dress shoes. Steel is heavy, but it resists extreme twisting and provides strong protection under the foot.

Nylon and TPU shanks are common in sneakers and athletic shoes. They are lighter than steel, flex slightly, and still offer meaningful torsional resistance. Most running shoes and court shoes use this type.

Carbon fiber shanks are the lightest and most expensive. They are used in high-performance running shoes and some flagship basketball shoes. Carbon fiber provides high stiffness at low weight, but it is brittle and not meant to flex much.

Which sneakers have a shank

Not all sneakers have a shank. A simple lifestyle sneaker with a flat rubber cupsole and a soft EVA foam midsole usually has no shank at all. The shoe is flexible, and that is by design.

Sneakers that typically include a shank include:

• Court and basketball shoes, which need lateral stability for cuts and jumps
• Trail running shoes, which need protection and stability on uneven ground
• Stability running shoes, which use a shank or a medial post to control overpronation
• Some premium walking shoes, which add a shank for midfoot support during long days on your feet
• Boots styled as sneakers, which carry over the shank from their boot heritage

How to check for a shank

You can test a shoe for a shank with a simple twist. Hold the heel in one hand and the forefoot in the other, then twist in opposite directions. If the shoe resists twisting and springs back, it likely has a shank. If it twists easily and folds, there is no shank, or it is very flexible.

Another way is to press on the midfoot from below. A rigid shank will make the midfoot feel firm and unyielding. Without a shank, you can feel the foam compress and the sole flex when you press the arch area.

For a more detailed look at how a shoe's flexibility interacts with the rest of its construction, see our guide on sneaker flexibility and the related article on torsion stiffness loss.

Who benefits from a shank

A shank is not essential for every sneaker wearer. But it helps in several situations.

If you have flat feet or low arches, a shank can reduce the demand on your arch muscles by preventing the shoe from collapsing inward. The shank also works with the heel counter to keep the rearfoot aligned. The National Institute for Occupational Safety and Health (NIOSH) publishes guidance for workers who stand on hard surfaces for long shifts, recommending supportive footwear to reduce foot fatigue. A shank contributes to that support.

If you do a lot of heavy lifting, a rigid shoe with a shank provides a stable base. Weightlifting shoes and some training sneakers include a stiff shank to keep the foot from rolling during squats or deadlifts. If you carry heavy loads, such as on a job site or in a backpack, a shank helps prevent the shoe from folding under uneven weight.

If you have plantar fasciitis, a shank may provide relief by limiting the stretch on the plantar fascia. The stiff midfoot acts as a lever, reducing the demand on the arch during push-off. See our guide on plantar fasciitis sneakers for more details.

When to skip the shank

There is no single answer for everyone. If you value natural foot movement and flexibility, a shoe without a shank is a better choice. Minimalist sneakers, many yoga-style shoes, and some casual slip-ons have no shank at all, and that flexibility is a feature.

If you have high arches, you may not need a shank at all. A curved, flexible shoe allows your arch to move naturally, and a rigid shank may feel like a rock under your foot. The same applies to people who walk on soft surfaces only, like carpet or grass, where the ground does not push back hard enough to require a stiff platform.

When you are shopping, do not assume a shank is always better. Try the shoe, twist it, and walk in it. The right choice depends on your foot type, your activity, and your comfort. You can read more about arch type and how it affects your shoe choice.

What to pick for your use

Questions

What does a shank do in a shoe?

A shank is a rigid plate under the arch that increases torsional stiffness. It resists twisting so the shoe stays stable when you move, especially during lateral cuts, uneven terrain, or heavy loads.

Is a shank the same as arch support?

No. Arch support is usually a shaped insole or midsole contour that cradles the arch. A shank is a stiff plate that resists twisting. They work together, but they are different features. Some shoes with a shank have little arch support, and some shoes with good arch support have no shank.

Do running shoes have shanks?

Many running shoes have a nylon or TPU shank, especially stability models. Some lightweight racing shoes do not, to save weight. Trail running shoes often have a shank that also acts as a rock plate to protect the foot from sharp stones.

Can a shoe shank cause foot pain?

A shank that is too stiff for your foot can feel uncomfortable, especially if you have high arches or prefer a flexible shoe. If the shank places pressure on the midfoot, you may feel pain. In that case, choose a more flexible shoe or one with a softer shank.

Are steel shanks better than plastic shanks?

Steel is stiffer and more protective, which is why work boots and hiking boots use it. Plastic shanks are lighter and slightly flexible, which is usually enough for sneakers. The right one depends on the activity and the level of stiffness you need.