> Can you describe your thermals (you mention they are unlike US thermals)?
First I should mention that I have been a Tester at BGT for about three different brands of USA thermals, and I have to say I was disappointed in all of them. OK, maybe they were all off-beat companies trying to get attention - maybe, but none of them turned out to be much use and none of them went into my 'active bushwalking stock'. If you can suggest more suitable USA brands, I would be interested.
Second, the current fad for Merino is largely marketing-driven in my opinion, rather than being based on any technical advantage. Sure, fine Merino wool is both comfortable and warm (I spent 27 years associated with wool research), but it takes AGES to dry. The synthetics dry very fast in comparison. Also, the synthetics last a lot longer imho, although some of the wool/synthetics last fairly well. However, I suspect that the big (overwhelming) market is to the trendy fashion market for whom style (ie marketing) matters far, far more.
My favourite thermals were the Macpac Geothermals, but these are no longer available from them. Macpac has gone woolly like Icebreaker. Sad. But the company nearly went broke with their 'Made in NZ' policy, and a new management took over and outsourced all the manufacturing to Asia.
The local Boy Scout chain shop (Snowgum) still sells polypropylene thermals, see http://www.snowgum.com.au/Product_ProductDetail.aspx?ProductID=2966
for an example. Not the easiest colour to display unfortunately.
The excellent UK firm Peter Storm does some very good thermals in chlorofibre - see the pic of 'Thermal underwear' on this page http://www.peterstorm.com/products.htm . You don't have to have pink btw - Sue uses the model 521 in a navy blue. You can get colour pics on the their ebay store page.
Another NZ company called Kathmandu sells something similar, see item 3 on http://www.kathmandu.co.nz/102.html - Page 102 of their catalog I think.
The Australian company Wilderness Wear makes thermals in polypro, chloro and using merino - see http://www.wildernesswear.com.au/department.asp?departmentID=125&expandlist=|125||2|
for examples of each. Love the jazzy colours for the polypro.