Used this last night at Mohican. Dont' know how cold it got but we had a few flurries through the night. Though I was using a 30* down bag, I was warmer on top than on bottom. My pad is rated for -11F, made with down. My back was never really cold, but never warmed up like with a UQ. I was using a fast fly tarp so I had little to no side coverage but I wouldn't think convection would be an issue with a dowmat. Clearly I have a faction of my kit that needs addressing, just can't figure if it's possibly the tarp and convection or what. Any ideas why the downmat can't keep me warm in a WBRR? Ate and peed before bed so should've been prime to cook in there.