I'm a size 8.5 and the size M fit me perfectly. Colors are beautiful and very breathable cotton sock.
I was disappointed by the fit of these socks, I'm a women's size 8 so ordered a S per the size chart but the socks did not fit very snugly. I ended up with some bunching in by cycling shoes and the socks slide down a bit. They work (and I love the print) but I would not choose to purchase these again. I've got pretty average sized lady feet, would love Ornot to make socks small enough to accommodate!
Super stoked on the overall package. Love the height. Love the weight and the semi-compression of the upper. Color and style are a plus!