Hi Andy - This is my 5th pair of boots at Nubble and I am impressed with these. I fell, big time, there last January as you probably remember from my postings and it isn't going to happen again if I can avoid it. The way these boots seem to work is the sole pattern is made up of little v's very close together. They are made of soft rubber which probably works the way snow tires work by grabbing/gripping the mud or snow between the treads as the rubber is pushed down and spreads sideways when you walk on them. I could feel them grabbing well onto the plant life/algae and holding, but they don't feel real solid on bare, wet rock. I don't think they would work any better on ice unless the rubber is more sticky than a lot of the harder soles. My dry suit boots have a very slippery sole. Maybe I'll buy a set of these in a size 16 and see if they will fit over them....Joe