Long time lurker, first time poster… STP has a version of the NeoAir in stock that's built with the same construction/materials as the XTherm pads– 30D/70D, triangular core, reflective barrier material. The specs on STP's site have changed from 5.7R to 2.5R since the pad was listed, so I called Cascade Designs to verify the numbers. CD confirmed that they manufactured such an animal at one point– essentially a rectangular XTherm, called the NeoAir EXP, rated at 5.7R.
With the standard coupons this is a great deal on a 4 season pad.

