sweet, stinky sock
I did a few canyons in zion renting shoes and socks. By the end of each day my feet smelled like the last 15 euro tourists whose sweat had pooled in the socks. So I decided if i was going to hike all day in sweaty socks it might as well be my own sweat. These socks keep you warm even in late fall weather pooled in Spry and Pine Creek canyons and are just think enough to provide some cushion for long days rappelling/stemming/scrambling etc.
Good socks for canyoneering. I would imagine they would work well for kayaking as well.