Stohlquist Men's Tideline Boots give you good protection from the cold. Size seems to run true to size. They can be a little tough to take off when wet. The 5 mm neoprene uppers are quite warm and there is just enough room to slide your foot in with a good ski boot sock to help wick moisture away. As for the out soles these are or should be good enough for putting in your Yak or canoe.
If you are looking for something with major support for portages better find something better these just will not cut it. but for me and yak fishing these will work great.