A standard women's sock size is usually presented on sock packaging as "Size 9-11." This usually translates to a women's U.S. shoe size 5-10 (European 36-41, UK 3-8).
Men's Sock Sizes
A standard men's sock size is usually presented on sock packaging as "Size 10-13." This usually translates to a men's U.S. shoe size 8-12.5 (European 42-46, UK 7-12).
In general, your safest bet is to wash your socks in cooler water, like colors, turned inside out to prevent piling, then hang or lay flat to dry or tumble dry low. This helps preserve their color, shape and quality for as long as possible. Please, do not bleach your socks.