Has anybody ever hear about Cold Killers. There out of the U.K. and I am thinking about ordering Cold Killer Sport Top II.
I have not heard of any companies selling the same type of product in the USA, that make the same claim as Planet Knox.
Plus I have never ordered anything out of the U.K. so I don't know how it works (U.S. Customs).
Any feedback would help.

Try this:
http://www.schampa.com/item.asp?iid=1032

i also have the schampa
paid $15 on Ebay

very well-made and does what it needs to do

although i am in Texas and it doesnt get all that cold around here

woops, just realized you're looking for shirts/tops

try Cabela's or REI. they have plenty to choose from