I bought these for use post surgery. I had patellar tendon repair and after two weeks they removed the TED hose they put on. After removing these there was significant swelling in the ankle foot and lower calf area. I used these to provide compression as well as circulation to move the swelling out. Within about 6 hours my foot ankle and calf had returned to their normal size.
Once I'm healthy again I can't wait to try these out for mountain biking. I have a Men's size 11 foot and the Large worked perfectly.