Short Answer
Overview
In the context of footwear, the letter ‘B’ denotes the width of the shoe, which is a separate measurement from the length (the numerical size). Shoe width is measured around the ball of the foot to ensure the shoe provides an adequate fit without being too tight or too loose. Because anatomical differences exist between genders, the meaning of ‘B’ varies depending on whether the shoe is marketed for men or women. In women’s sizing, ‘B’ is typically the standard or medium width. In men’s sizing, ‘B’ is categorized as a narrow width, as the standard medium width for men is typically denoted by ‘D’.
History / Background
The standardization of shoe widths emerged as the footwear industry moved from bespoke, handmade cobbling to mass production in the late 19th and early 20th centuries. To increase efficiency and reduce returns, manufacturers developed a lettering system to categorize the girth of the foot. This system allows consumers to find shoes that accommodate different foot shapes—such as narrow, medium, and wide—without needing to change the length of the shoe. While different regions (such as the US, UK, and EU) have different length standards, the alphabetical width system is widely utilized in North American markets to provide a more precise fit.
Importance and Impact
Correct width selection is critical for both comfort and long-term podiatric health. When a shoe is too narrow (e.g., a person with a wide foot wearing a B-width shoe), it can lead to the development of bunions, hammertoes, and blisters. Conversely, a shoe that is too wide can cause the foot to slide, leading to instability, lack of arch support, and an increased risk of blisters or ankle sprains. By providing a specific ‘B’ width option, manufacturers allow users to align the shoe’s internal volume with their specific anatomical needs.
Why It Matters
For the modern consumer, understanding width designations prevents the common error of purchasing a larger numerical size to accommodate a wider foot. Increasing the length of a shoe to gain width often results in the arch of the shoe being misplaced and the toe box being excessively long, which can cause tripping or inefficient walking mechanics. Recognizing that ‘B’ represents a specific width allows for a more accurate fit, reducing the need for aftermarket inserts or professional stretching.
Common Misconceptions
A ‘B’ width means the same thing for both men and women.
Width scales are gender-specific; ‘B’ is medium for women but narrow for men.
If a shoe is too tight, you should just buy a size larger (e.g., from 9 to 10).
Increasing length does not proportionally increase width; you should instead seek a wider width designation (e.g., moving from B to D).
All brands use the exact same measurements for ‘B’ width.
While there are industry standards, different manufacturers may have slight variations in their lasts, meaning a ‘B’ in one brand may feel different in another.
FAQ
Is a B width narrow for women?
No, for women, B is generally considered the standard or medium width, though some brands may label it as 'M'.
What happens if I wear B width shoes but have a wide foot?
You may experience pinching at the toes, pressure on the sides of the foot, and an increased risk of developing bunions.
How do I know if I need a B width shoe?
If standard shoes feel loose around the sides or your foot slides forward, you may need a narrower width like B (for men) or a narrower alternative for women.
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