Started using these years ago, will not use a pair of sneakers now without swapping out the factory liner (e.g. fluffy cardboard) for a pair of these insoles. Fairly true to size. I measured against my feet in store, and between a "D" and an "E", the slightly larger "E" seemed like the way to go. Have to trim a bit around the toes for it to fit correctly, but that's 60 careful seconds (you only get one chance when cutting these $50 insoles) with a scissors to make it right---recommend that you pull the factory sole, place it on the replacement insole, make sure the HEEL portion is aligned correctly between the two, then trim any part that is sticking out around the factory insole. HOLD IT TIGHT so it doesn't shift mid-cut. If you're not sure, cut wide. You can always make another cut to trim. Important you don't cut too much, or your foot will be larger than the insole, and that will feel weird, and not give good support.
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