Been trunking it for about 2 months here in carolina beach, nc. I have a 1.5 jacket and that's been fine for a while now. My buddy's been out of a 3/2 for about 3 weeks now. I'm 5'7 and he's 6'3 so i'm guessing it's because he's so much taller that he gets cold. Also I used to live in LA where the water is alot cooler this time of year, so I go to trunks at about 65 degrees. It's 78 now and doesn't feel refreshing anymore.