They need to fit your shoes so they hold their shape. They also have to allow for air flow. They prevent the leather from shrinking/warping in weird ways after sucking up your feet sweat all day.
@Aroogah started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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They need to fit your shoes so they hold their shape. They also have to allow for air flow. They prevent the leather from shrinking/warping in weird ways after sucking up your feet sweat all day.