I got Men's XL, supposedly US shoe size 10-13. My daughter wears Women's US size 6.5 athletic shoes. She said they're snug on her, but at least she can wear them.
Pros
very comfortable, no blister on these even for the long distance runs!
Cons
The ankle-length design may not provide enough coverage for some users, leaving them vulnerable to blisters and chafing
I am a diabetic and work on concrete floors. These socks are perfect for me. They are moisture wicking and very supportive. I have not had any problems with my feet or legs swelling while at work. They worked so well for me I bought more pairs to use when I go hiking and or ride my bike. Again no swelling and I don''t get blisters on my feet when I''m outside in the heat all day. Highly recommend.