Wijbrandus
Contributor
Furner:Has anyone tried the underarmor stuff? might give a little extra insulation, but i dont know how it handles water, especially salt water
A friend of mine bought an underarmor shirt. It didn't hold up through a single weekend of diving. The wetsuit just tore it apart.
On the other hand, I bought a rashguard that's held up very well.
I think something like a Henderson hotskin or whatever it's called is the way to go.