HHSS at 30F/ feels like 19F

The old HH Super Shelter is still working 12+ years later. I still consider the lower limit for me, with any add on or mods, just the basic 1 pad + space blanket + sil-nylon undercover system. I was plenty warm in upper body and just barely warm enough butt and legs(feet toasty, no socks). In this pic, I have added a thin fleece jacket below pad and wrapped a 12 oz synthetic jacket around the foot end, an I am toast warm head to foot, top and bottom(SMR 30F TQ is VERY warm)