In a

boot A boot is a type of footwear. Most boots mainly cover the foot and the ankle, while some also cover some part of the lower calf. Some boots extend up the leg, sometimes as far as the knee or even the hip. Most boots have a heel that is c ...

shoe A shoe is an item of footwear intended to protect and comfort the human foot. They are often worn with a sock. Shoes are also used as an item of decoration and fashion. The design of shoes has varied enormously through time and from cultur ...

, the shank is a long, thin piece of material between the insole and

outsole A shoe is an item of footwear intended to protect and comfort the human foot. They are often worn with a sock. Shoes are also used as an item of decoration and fashion. The design of shoes has varied enormously through time and from culture to ...

intended to support the foot and provide structure.

Background

Materials and design for shanks vary widely with the purpose of the footwear. The shank of a pointe shoe used for ballet is made of flexible materials like leather, plastic, or cardstock, and may have customized length, thickness, and stiffness. Heavy boots such as those used for construction or hiking have far more rigid and durable shanks, often using

steel Steel is an alloy made up of iron with added carbon to improve its strength and fracture resistance compared to other forms of iron. Many other elements may be present or added. Stainless steels that are corrosion- and oxidation-resistan ...

, though contemporary shanks are more commonly made of less heat-conductive materials such as

fiberglass Fiberglass ( American English) or fibreglass (Commonwealth English) is a common type of fiber-reinforced plastic using glass fiber. The fibers may be randomly arranged, flattened into a sheet called a chopped strand mat, or woven into glass cl ...

and

Kevlar Kevlar (para-aramid) is a strong, heat-resistant synthetic fiber, related to other aramids such as Nomex and Technora. Developed by Stephanie Kwolek at DuPont in 1965, the high-strength material was first used commercially in the early 1970s a ...

. These materials' rigid nature adds a protective element, helping shield feet from puncture wounds and stone bruises. The shank is crucial to the functionality of mountaineering boots, as they diminish the load incurred by the feet and calves over the course of an ascent.

References

Footwear components {{clothing-stub