Wanted and ordered size 11, but apparently 11 not available. These size 13, although too long, actually do fit and stay on. WARNING: IF WORN IN WATER, the insoles come out. Use E6000 waterproof glue before wearing to stabilize and fix the insoles. I do aquatic exercises two times a week and wear these from the time I leave home, in the pool, and back home. Once they are wet they are difficult to get off, so they don't come off during my exercises. That's a good thing! Recommend getting two pair to allow one pair to thoroughly dry before next use to avoid mildew.