They fit my womens size 11 feet great, nice and roomy still. Also they don't leave those rings or imprints from the top of the socks on my ankles. They're a bit thicker that other ones I have  so I love them. Having larger feet, I would buy these again in the black color design. I don't know if the other colors perform the same, but I will definitely reorder these because I have an entire drawer full of ones that slide off when sleeping or leave rings around my ankles or the toes are too tight. I love them! I do wash them inside a mesh bag so the lint doesn't collect on everything else and they do just fine.