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I'm an 8/8.5 and bought a small/medium. These fit snugly on my feet. The socks wick moisture away from the feet and are suitable for athletic wear. I wear mine while ice skating and haven't had any problems with blistering or excess foot sweat. The cuff is slightly thicker than the sock and fits approximately 2" to 3" above the ankle bone. I haven't had any problems with them sliding down. It does take some effort to remove them as they don't have a lot of stretch. There's a beaver on the cuff of each sock making a thumbs up gesture. Who doesn't love beavers? I love beavers and I love these socks. I highly recommend.