Goassamer gear make a Evazote foam pad called the NightLight 3/4 Length Sleeping Pad, weighing in at a hefty 230grams......

R value 2.27
http://www.gossamergear.com/cgi-bin/gos ... arter.html
Its rated for 3 season use but will it do the job?
Has anybody found a lighter/not much heavier alternative that keeps you warm?
Im using a Western Mountaineering Badger MF rated to -10 on top with a silk liner....want to be tooooooasty

Knowledge anybody?