When choosing the correct insole (or insert) one of the most important parameters is the insole Sizing: The size of an insole is usually communicated as a shoe size range. A complete and easy-to-use Insoles Size Chart will help you answer all questions to buy appropriately sized inserts for your shoes or needs.
For example, “Men’s 9-11” (each manufacturer uses different sizing). For most full-length insoles, this is because the insoles are designed to be trimmed before use (trim-to-fit); the insole is manufactured to be used in a range of shoe sizes, and the consumer is expected to trim off any unneeded length from the end of the insole when placing the insole into their footwear. For 3/4-length insoles and other insert pieces, the size range on the product denotes the footwear sizes in which the insoles/inserts can be comfortably used; 3/4-length insoles and inserts are usually not designed to be trimmed in any way. If you are between sizes (you wear a size 9.5 when the insoles are sized “8-9” and “10-11”), you should buy the next size up.