I use the Wallyworld waffle patterned blue pad as it is 24" wide and I find it wide enough for my 6ft 2 and 28 lbs. I used it to 18 degrees one time last winter.
Some people complain about condensation problems when using pads, I have yet to run into that problem. I'm thinking that the waffle pattern of this pad allows for some air circulation thus cutting down on condensation.
Pictue is on the pad in my wife's BB 1.0 dbl