xerotherm arctic

[ScubaAl]

So I did a search on TDS
[/quote]
I saw that thread as well.  It sounds like they are nice undergarments with better mobility and less bulk.  The drawback is expense.  From what I gathered from that thread you need to layer their Arctic garment with their regular xerotherm garment in order to equal the insulation of a DUI Ultra 400 (aka C4) thinsulate or a Weezle Extreme +.  Probably still less bulky/better mobility with the layering combination but more expensive in the end. 
Here is a link with some info. 
[/quote]
I hear you on cost, what $540.00 or so for the arctic and xerotherm, unreal. I would probably get the xerotherm arctic and add my own base layer. I'm leaning towards the new smartwool products. I pickup a smartwool long sleeve shirt yesterday at REI ($70.00) wore it today at work, outside. I had so much on, hard to say if the smartwool made any difference.
I agree that with the xerotherm combo it would still be less bulky/buoyant then some of the other options.
I did check the above link the other day, but would like to buy locally if I can.
                                          Thanks for the input, Al