The 3 in 1s that come with a somewhat thin inter layer ain't really meant to be use in extreme cold weather. Some 3 in 1s do come with 600+ fill down inter jacket tho. Now those are good for some serious cold.

I was surfing different brands of jackets and some of them are fill with 800+ down... NOW THAT IS MT. FUJI READY. <img src="/ubbthreads/images/graemlins/laugh.gif" alt="" />

Last edited by KENKEN; 11/17/08 01:34 PM.
JYD #84 This is my rifle, and that is my SHTF Busse knife.