I have one of these and it is REALLY great stuff. Really warm.
http://www.sportsmansguide.com/net/cb/cb.aspx?a=1146235&ecid=salewk073tsgcold&em_id=clbeener@columbus.rr.com&utm_source=internal&utm_medium=email-sale&utm_campaign=salewk073tsgcold
http://www.sportsmansguide.com/net/cb/cb.aspx?a=1146235&ecid=salewk073tsgcold&em_id=clbeener@columbus.rr.com&utm_source=internal&utm_medium=email-sale&utm_campaign=salewk073tsgcold