Hmm... I've worn my sleeveless down to below 60, which felt a little crazy. Armpits and arms could have used the extra coverage.It was still a surprisingly fast swim, though, I just felt like my arms never warmed up. I could tell after the first 200-500m that it would be too cold the whole way.
I think 66 would be warm enough, definitely over 70. If you'd get a chance to swim in the water in advance (like the day before), I'd test it out, though.



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It was still a surprisingly fast swim, though, I just felt like my arms never warmed up. I could tell after the first 200-500m that it would be too cold the whole way.

