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I guess I hood is a necessity for us then. What brands are better then others?
A key feature is at least one vent in the top to let out trapped air. Otherwise you will get a bubble on the top of the head. My Henderson works well in that regard.
This is one of the issues I have with diving here in Pa. Most waters are on the cool to cold side. Just a suggestion, but if it were me I'd just bite the bullet and get a dry suit and be done with it.
I have dove in 55 degree water with a 7mm farmer john and it still isn't fun. And diving is something I do for fun. That's why I only do tropics and almost always with a Microprene (.5 mm)
A farmer john is a 2 layered wetsuit. You have one layer that looks like overalls and one layer that looks like a shorty that fits over it. Then you have 14mm over your "core", and 7mm over your legs and arms. You are a brave man to take a 7mm wetsuit into 40F water. After a few boat dives in my full 7mm suit it starts getting cold.
That is good to know I'm a pretty skinny dude also, so there is not much to keep me warm naturally. I thought I rash guard was for diving without a wetsuit? Thanks for the tips.Heh. I guess it really comes down to your own tolerance for cold. I routinely dive in 55 degree water with a 7mm farmer john + hood (and I'm a skinny SOB with little built-in insulation). If anything, I feel overheated unless I'm at depth with this wetsuit.
Dressing in layers applies to SCUBA too. I've got a full-body rash guard that I can put on under my farmer john for really chilly water, and it's a great way to keep warm without going the dry-suit route.