Well I've always loved Crocs and this pair is fantastic. I have a big foot so sometimes I buy men's shoes so I wear women's shoes 11 1/2 - 12 and buy men's size 11. They are very comfortable and I tried them on without socks. A size 11 gives your foot a lot of room, but if you wear a size 11 for women, I would recommend a size 10 for men.