The cutoff for USAT races is above 78 degrees. For the vast majority of people there is no reason NOT to wear a wetsuit until it is too warm and they are not allowed. There are a few people that overheat right around the cutoff, but not most. 72 isn't even close. I would be cold swimming a 1/2IM in 72 without a wetsuit. I could do it, no problem, but I'd be a heck of a lot more comfortable temp. wise with a wetsuit, not to mention approximately 3 minutes faster.
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Justin in Austin, get it? :)
Cool races:
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Redman -
Desoto American Triple T