These are my choice for cold water paddling and portaging. The most significant factor in my choice was fit. I could literally walk all day in these boots with no ill effects. I reluctantly bought these knowing that water would be too cold to wet foot wich I prefer but after 20 days of rigorous tripping including some bushwhacking I really do like these boots and I also like dry feet at the end of a cold day. Swimming in them????? I doubt it, but then consider all of the other junk you'll be wearing on a cold day including your PFD. Better I think to kick them off if swimming is necessary.