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The US Military Wool Boot Insoles are designed for use in the Mukluk boots, which are designed for extreme cold weather use. With the standard size of these felt wool inserts you can easily adapt them to fit into virtually any pair of boots. If your boots are similar in size to the insoles, you can just insert and use them as they are. Should you need a smaller size, the material is easy to trim for a custom fit for your favorite pair of boots.