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?Arthur Heckler introduced the unique numbering system for New Balance shoes. He chose to use model numbers instead of names to emphasize the company philosophy instead of focusing on any one shoe.

The letters before and after the numbers denote a specific characteristic of the shoe. The letters before the numbers indicate whether the shoe is for men or women and the purpose of the shoe design. For example, WT means the shoe is a woman’s trail shoe. The letters after the numbers usually denote the shoe color, but not always. W/B indicates the shoe is white and blue. Occasionally, the letters after the numbers indicate another special characteristic of the shoe, such as ST for stability shoe. See the Resources section of this article for a link to a complete list of letter codes.

The complete model number, with the letters included, is located inside the shoe on the tongue. Normally, only the numbers are displayed on the exterior of the shoe.