I have found a solution to the Thermarest slippage problem that I believe also passes the lightweight and multi-use tests. I bought a ThinLight 1/8 insulation pad from Gossamer Gear and cut it down to 47" to match the length of my pad. At that length, it weighs 1.6 oz. This lightweight piece of insulation sticks to my pad and the tent floor and stops the slippage. It also increases the amount of insulation I have underneath. I can also fold it over a couple of times and use it sit on or kneel on. All for $9.