scubadobadoo:
Fleece will never do it (with a bag suit) because it compresses too much at depth. More layers help but at a certain point you become the Micheline Man/Woman and that's not fun for many reasons especially in the summer when it's hot outside or if you have a tight fitting dry suit.
I'm doing long, low-activity dives and I don't like being cold at all, so "toasty warm" is exactly what I wanted and what I got with my fleece layers. Not at all hard to do, even for long, coldwater dives such as 90 minutes in temps in the low 40's.
I get the same "toasty warm" in water down to the mid-30's when I switch to Weezle Extreme Plus. It can be done. I did get a little chilled after 1 hour and 50 minutes in 32-degree saltwater once, though.
You're right that a tight suit will limit how many layers of fleece can be used. Excessively tight can be counterproductive. Luckily, my suit is roomy enough for my thickest combinations.
As to overheating during the suiting up, that can be reduced greatly with a few simple measures, too.
scubadobadoo:
So what next? Dry gloves maybe? The reality is that unless one swims hard, when the water is REALLY cold, eventually you will get cold too. No way around it after 20 minutes or less. It's cold water diving and anyone who says they are "toasty warm" in 40 degree water is either lying/dry suit boasting or they are a polar bear. "Toasty warm" is what one feels while sitting next to a bonfire, lol.
I definitely tend to get cold more easily than most people, I think, because I'm older, more sedentary and I'm doing low-activity dives. That's why I experimented until I got this "toasty warm", "in my living room", kind of warmth.
Hate to quote myself, but the details of what I use are here:
http://www.scubaboard.com/showpost.p...9&postcount=12
I think it makes a big difference to effectively insulate
all areas of the body because your core heat will be slowly drained by even one cold area.
That means an ice cap underhood makes a difference. It means that the second dryglove liner helps. A loose-fitting dryglove will help. The fleece chest pad helps a great deal.
If I omit any of those items, it becomes apparent by the end of the dive.
Avoiding sweating when suiting up or during the dive can make all the difference, too.
Using extra lead and more air in the suit and using the suit for buoyancy control is warmer for me than going with squeeze and using the bcd for buoyancy control.
Avoiding constiction is important, especially at body joints. Not gripping the flag line too hard or too long with the same hand can help.
scubadobadoo:
So my answer is...it doesn't matter what you use. You are gonna get cold but using material that doesn't compress at depth does help a bit.
I'd like to try Thinsulate sometime because they say it's less compressible, but in the meantime, my extra layers of fleece create enough loft even when compressed.
scubadobadoo:
All that said, I am a very SLOW and POKEY diver so that doesn't help with my warmth. Also for the record I am a medium build guy...5ft 9inches and 170 pounds. I lost almost 60 pounds over three years ago and I have been freezing ever since while cold water diving.
If I were going any slower, I'd end up with barnacles or perhaps getting towed by a rescue diver!
But, you do have a point about your smaller amount of natural insulation.... I'm the same height, but have an extra 20 lbs. It's not muscle either.... hey, maybe I can call that blubber a dive accessory!
Anyway, layers of fleece can be definitely be "toasty warm" in the right combination. I wouldn't dive in cold water if it weren't!
Dave C