I wore a 3mm on my liveaboard trip to Saba last spring and was getting cool toward the end of the week. I'll be using a 5/4 for my next trip(with pockets, no less...). I expect to be keeping warmer practicing my back kick too!
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When I'm diving wet, I'm actually a big fan of using more wetsuit than I need to keep me warm. As long as I'm not all the way to overheating, the more heat I conserve, the less energy I expend.Im not a fan of using more wetsuit than I need to keep me warm at depth.
I consider neoprene the enemy.Neoprene is our friend and we should embrace it.
I think I would stroke out if I didn't dive wet in tropics I need to feel cold at least momentarily. But I agree with TSandM, I think my 3mm isn't cutting it - not when doing 4-5x 60min dives a day at least. However warm the water, it just isn't enough to keep the core warm anymore, under or above.
So anyone interested in good deal with men's Bare 3mm with one bellows pocket glued on, let me know. I need to move onto 5mm for good too.
The other thing I always wonder at is the ill fitting wetsuits I see out there.