I purchased the "Acorn Versa Fleece Socks" in several colors in the US Women's size 8.5-9.5 (US Men's 7-8) and they are snug. My shoe size is 8.5 Narrow and they are a perfect fit. But if you are a size 9 or 9.5 or have a wide foot these might be too short or tight. I wear the socks at home for during the day with sweats and I love them. We have tile floors so in cold weather I need these. My feet do not slide on our tiles so I don't need any traction on the bottom of my socks for during the day. My husband likes the Acorn socks for sleeping but he tends to slip easily so can't wear them during the day. The brand is terrific, I've worn them for years.