or does it have to be a thermos type undershirt...

Can't hurt. I used to wear one under my old zipperless 3/2, made it a little easier to get out of. Not sure it added much warmth though. I have a couple 1.5 mm tops and a 2 mm vets that would work but my new suit (O'Neill 4/3 Heat) doesn't need any additional help


Filed under: Rash Guards

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