cool with cold
I'm pretty used to the cold and much prefer swimming in colder waters. Never worn a wet-suit even for longer swims (2+ hours) in ~55 deg water. I usually only get chilled upon exit when air temps are also low. I don't imagine the shirt would help with that anyway.
I don't know that It would be worth it for me to buy, but thought I'd ask just in case it might help me when temps drop below 50.
Thanks for the info.