Yes the underquilt is major.
Winter UQ combo : DIY-IX-multi-layer-multi-season-adjustable-backpacking-UQ plus Speer Snugfit.
This has worked well into the teens in the past. Worked well at NJWinterHang's 3*.
A) DIY-IX base layer : ripstop+IX-sewn-head+foot (not sides, 40"wide, extra10" on each side stitched to itself, but not to ripstop; free to trap air) channels head+foot, cordlocked-tight; channels on side with shock cord
B) Floating IX-layer #1 and Floating IX-layer #2 ( added to suit temp ) attached with ties in corners, sometimes both together; summer use IX-between layers in WBBB
C) ripstop with channels 4 sides : protective cover under Snugfit in winter; UQ base with floating layer(s) in warmer weather; good windcover when not using tarp.
When vanCamping :This set up is also divided into two complete sets. Changing them up as my husband and I need.
The Snugfit (a piece of art/sculpture) bought for my husband so he would hang in cooler weather with me.
The DIY was intended as a prototype sized for him, works well, so I never got around to making a shorter set up for me.
Backpacking TQ is combo of IX that has worked well with down clothing to just below 30*.
At the NJWinterHang was using the heavy-double-fleece-TQ used for vanCamping.
trailname : Distracted By Stone
Last edited by G...Hawk; 01-30-2013 at 17:44..