I bought them to put on my waterproof winter boots. I'm a size 10.5ft (men) and boots size 11. I took XL to compensate for possible shrinkage that can also occur with hand washing. The socks are slightly longer, about an inch. I don't mind, but if your boots aren't big enough, it can get tight and annoying. The weather here in Seattle has only hit 32 degrees since I've had them. Most of the time they are warmer than without but I still had to wear thick socks to actually keep my feet warm, they can be worn as socks around the house if you don't want to turn on the heating. .
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