Well, I just pulled the trigger on a two piece T2 set to take to Costa Rica in April or May. It supposedly is good to 68f, and the water can get to 68f there on the Pacific side, according to the always reliable internet. It wasn't cheap, even on sale. I'm hoping it will be more like diving in a rash guard than neoprene, except warmer. I haven't got cold diving in warm water yet, but that warm water never got below 77f. 68f is a lot cooler. Worst case, I freeze my buns off and rent a wetsuit and just eat the cost of the Sharkskin.