For a nice article on warmth go to w_ww.geartrends.com/cgi-bin/geartrends/HTB-StayingWarm-Science_ (http://www.geartrends.com/cgi-bin/geartrends/HTB-StayingWarm-Science) . Thank you for your attention. Switchback the Warmer ************************************** See what's free at http://www.aol.com.