Using size charts effectively requires understanding both length and width measurements, as both are crucial for finding the right fit in barefoot shoes. Most size charts provide either the internal length of the shoe or the recommended foot length. If the chart shows internal length, you should add approximately 12 mm to your foot length to ensure enough room for natural toe movement. While 12 mm is generally ideal, the amount of space needed can vary—less space might be fine for sandals, while more space may be necessary for boots or shoes worn with thicker socks. Additionally, factors like your foot shape, volume, and width also play a significant role in determining the ideal amount of space.
In some cases, size charts might show the recommended foot length. In this case, you should find the size closest to your foot measurement without going smaller. However, this method is less commonly used because you can’t always be sure how much space for your toes was considered in the recommendation, potentially resulting in less room than is preferred for natural foot movement.
Width measurements are more complex because they try to describe three-dimensional feet using two-dimensional data. Due to the many factors that influence how the width feels inside the shoe—such as the volume of the shoe and foot, the design of the sole, materials used, etc.—and the different measuring techniques (horizontally, diagonally, or at various points), the value recorded in the size chart is not always consistent. This means that a shoe might sometimes feel wider or narrower depending on how it’s designed and the shape of your foot.
Given these variations, it’s essential to read the instructions provided by the brand or online shop and consider how the shoe’s design affects its fit. For a more detailed guide on measuring your feet and using size charts, visit our blog post on measuring feet for barefoot shoes.
