They fit a bit small, so go up a size. I have a weird foot... wear 10.5 in running/hiking shoes, but 8.5 in dress shoes. I bought a 9. They are nice and grippy on rocks, solid sole, good arch, narrow, extra padding on the outside of the heel and big toe (where the boat hits). With my playboating booties, I get a good callus on the outside of my heel after just a little while in my boat, but I think these will help. And they're on sale. I might get another pair as a backup b/c I like them so much and it looks like they are closeouts.