Barefoot shoe terms, explained.

Use these definitions to read a product page and compare the same measurement across models. Start with the exact shoe, size and source.

Zero drop

The heel and forefoot sit at the same height. This measurement does not tell you how thick, flexible or cushioned the sole is.

Toe box

The front part of a shoe around the toes. Compare its shape and available room as well as the stated width.

Ground feel

The sensation of the surface beneath your feet through a shoe. Sole materials and thickness affect it; the term is not a standardized fit or safety rating.

Stack height

The total thickness between the foot and the ground at a specified point. An outsole or removable-insole measurement alone is not necessarily total stack height.

Sole flexibility

How readily the sole bends or twists. A manufacturer description is not the same as a measured result under a specified test.

Anatomical or foot-shaped last

A last is the form used to shape a shoe. “Foot-shaped” describes a design approach; it does not guarantee a match for every foot.

Minimalist shoe

A category commonly associated with a low heel-to-toe drop, flexible construction and relatively little material underfoot. Features vary by model; there is no single feature that describes every pair.

Arch support

A shaped part of a shoe or an insert positioned beneath the arch. Whether support is appropriate is an individual question, especially when it has been prescribed.

Transition

A change in footwear or how it is used. People respond differently; there is no universal deadline for getting used to a new pair.

Toe spring

An upward curve at the front of the sole. It is a separate design feature from heel-to-toe drop.

Heel-to-toe drop

The difference in height under the heel and forefoot. A zero value is called zero drop; it should not be confused with stack height.

Toe splay

The spreading of the toes. A roomy toe box can provide space for movement, but a label alone does not establish the fit.

Put the terms to use

Compare kids’ models, explore women’s shoes, or read how we handle source measurements and missing information.