I use ankle high dive sox because they weigh 3.5 oz the pair, provide warmth and moisture protection, slip on and off easily over my hiking sox, have a slightly textured sole, can be used for stream crossings, and fold up small. Drawbacks; the neoprene is not breathable, so they would be hellacious in hot weather (not a problem at night and early morning where I hike), and since they go on and off easily, they would not work for crossing a muddy river bottom that would suck them right off my feet. Like the aquatics noted above, they don't have much padding under the foot. The brand I use is Deep See.
Sam Farrington, Chocorua NH