Just an estimate.
I am a warm sleeper and this is mostly for summer, early fall.
All between layers of a double layer
1 layer of insultex 72" x 48"
I did a quick indoor test and this immediately felt warm to the skin.
GG 1/4" large pad. I think it is 39" x 54"
WalMart blue pad, cut in half, and laid side by side
Read here it is good to 40dF.
Soft blue pad, probably 3/8". Its pretty dense foam, cut in half, side by side.
1 layer of fleece. Just average weight.
My quilts are 2.5xp for summer, 5oz xp for down to 25dF.