They are so thin that they fit under the strap in my surfski and let me use my toes to control the rudder peddles. And yet the bottom protects me well from the rocks.
This is not a very supportive shoe for long walks but it great for getting in and out of the boat to the car.
At last I can also fit my size 12 feet in many sit inside (SINK) kayaks as well. It is better to wear shoes when paddling to protect your feet as you cannot always be certain there are no sharp rocks, glass, or oysters where you take out.
This is the second time I've recommended something great from Surf to Summit. Seems like a trend is starting.