I just put these comments in another thread, but relevant here, so ...

IMO the advent of the Neoair XLite model makes the All Season model less interesting. In size regular (72" x 20" x 2.5") the XLite is 7 oz lighter (12 vs 19 oz), and has a listed R-value of 3.2, vs. 4.9 for the All Season.

If you want the beefier R-value, I would find it more flexible to buy one or more Gossamer Gear thinlight pads, in 1/4" or 1/8" (or one each, for max flexibility). In 1/8" thickness a thinlight pad is 2.2 oz. Admittedly, added bulk, but not too bad overall, and in warmer weather you can just leave it home.