Hi Jason,jbb:What kind of dry suit do you dive in and how close does it fit to your body? I have a weezle as well but have not found it to be that warm. My USIA suit doesn't fit that closely so I don't think it helps the insulation work as well as it could. I'm thinking of purchasing a CF200 custom made and am hoping that it will work with the weezle better. I also think I need to tuck the collar of the weezle down as I usually get a neck seal leak when I use it for some strange reason.
I dive a DUI 450, signature series - it was custom measured. It fits pretty well, and I've been real happy with it.
My drysuit is large enough that a Weezle fits beneath it with no real issues. I'm using a size Large Weezle. I have to fold my neck down also, to get a good fit on my neck seal.
Weezle's require loft to perform. If your suit is tight enough that the undergarment cannot loft, then it will not provide the necessary thermal effectiveness.
(Reflective undergarments that incorporate mylar and/or aluminum backed fabrics to radiate the body's heat back inward tend to NOT require the same degree of loft to provide equal warmth - or at least this is their claim. Additionally, they claim to provide more effective thermal protection if the suit floods. To the best of my knowledge there is no empirical data to support either claim. The 'proof' is subjective at best. There's little doubt, though, that the additional gas required for loft undergarments can be a PITA.)
The Weezle has been super warm in water temps in the high 30s - I've no complaint regarding warmth. Regretably, however, performance in the water must combine warmth with flexibility. I might find that an X-Large Weezle provides greater reach, I don't know - never tried one. My issues include the fact that when the suit is less that at 'full loft', the Weezle binds beneath the DUI 450 - the undergarment precludes stretching the arms back all the way necessary to perform valve drills (get at potential entanglements, reach back behind one, etc.) It's undeniably warm...but simply not optimal. Uncle Pug had the same problem, and solved it by having a professional seamstress sew football-shaped panels of elastic material into both underarm seams. I'm not sure why the undergarment doesn't come this way to begin with - this is not a new complaint.
I'll be seeking something offering equal warmth with greater flexibility, and will likely eventually wind up with one of the two-way stretch thinsulate garments.
As in all things, your mileage may vary (considerably).
Best,
Doc