I wear a women size 10, occasionally 11 depending on the brand. The men's size 10 fits perfectly. I tried a women's size 10 first and it was too small, returned them. I haven't worn them outside yet, but they seem comfortable and well made. The sole is some sort of foam rubber, I don't think it would hold up to hiking or even a lot of walking on anything hard, but it's nice and comfortable and I think it will be fine for a boat/beach shoe. If I think about it I'll update this review after I wear them for a week on vacation.