zski wrote on Feb 19^th, 2011 at 2:02pm:

So once you put the interchangeable soles on these Korkers they STAY on? No chance getting sucked off in the mud or peeled off trudging over rocks? Do you bring a spare pair of soles just in case? I may be changing the way I think about footwear --again.

I have never had a sole come off. I have had them unseat on the sides but not often.

If you look at the pictures of the soles above you will see the orange plastic tongue on the front. It slides in a groove 1.5 inches. You can see the orange tabs down the sides which lock in slots in the shoe.  On the back is a strap that has a hole in it. The strap pulls over a button so to speak on the back of the shoe. They stay very secure.

There is a video on their website that shows how they work. Bottom of the front page.
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I do take spare soles with me but not the same type. I take Felts, Lugs and Felts with studs. I clip the extra soles together through the button holes on the back straps with a carabiner and then clip them to the lacing loops on my boat.