From what I've read on here I might need the 250 if I'm in 40F water for a couple hours. What's the lower end of the water temp range you can do with the 150?
Thinking the 250 is a cheap insurance if I need it and not super expensive if I don't end up using it but would apprecaite your thoughts
40°F water for a couple hours is very likely going to require a lot more than the 250, maybe even active heating. I spent 52 minutes in 39° F water on NYE and I was getting fairly cold. That was with the tech base, a merino sweater, and the 250. w/ wool socks + dry gloves. This was actively swimming around a quarry @ 40 ft in a set of steel doubles, so effort wasn't exactly minimal, and certainly wasnt just hanging around on deco. 2 hours would have been miserable, especially if you weren't being quite active physically. I basically wear the 250 for anything in the 40s or below, and the 150 for anything above 50, but ymmv.