All measurements are specific to this product. The best way to determine the size you need is to find a similar item that fits you well, then measure the same way we do (see "How We Measure" tab) and compare with the measurements on the table below.
|Base of Buckle Prong to 1st Hole||29.073.7||33.083.8||36.592.7|
|Base of Buckle Prong to 4th (Middle) Hole||32.081.3||36.091.4||39.5100.3|
|Base of Buckle Prong to Last Hole||35.088.9||39.099.1||42.5108.0|