These have the low-profile fit I wanted for slipping in and out of my kayak, and the soles actually grip slick rocks at the put-in. My feet stayed warm even after getting soaked, which I didn't expect from such a thin shoe.
Wore these paddling on a cold river and my feet stayed warm the whole time, which surprised me for such a low-profile shoe. The grip on wet rocks is solid too, and they don't feel bulky in the boat.