Revain's general sizing chart isn't helpful to her and based on one of the customer reviews below I bought the wrong size. I hope this information is useful to someone: The size SMALL is marked on the packaging as US Men's 3-5 / US Women's 4.5-6.5 / European 36-38 / UK 2.5- 4.5 indicated. The size MEDIUM is indicated on the packaging. like Mens US 7.5-9.5 / Womens US 9-11 (yes crazy broken with the small size) / EU 39-42 / UK 5-7.5. I'm a women's size US 8 / EU 39 and the medium fits me best (small felt good at first but has shrunk to get too small). Also, the composition of the material is marked on the packaging as follows: 75% Coolmax 15% Polyamide 10% Lycra These look like very high quality socks and I look forward to wearing them. I also ordered Smartwool earbuds and liked them much better (softer and less grainy than Smartwools).
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