Gossamer Gear ThinLight 1/4" Wide Insulation Pad
The ThinLight pad is not designed for padding, but for insulation. It provides much better insulation for the bottom of your body than the equivalent weight of down when you are lying on it.
Made of Evazote foam, these pads are made with a unique high pressure nitrogen gas solution process. What this means to you is the foam is amazingly light and strong for its density. The pads are tough, flexible and resilient, and exhibit good UV stability. As a closed-cell foam, they will not absorb water.
Use for hammock sleeping - better insulation than the 1/8" for cold nights, and it's stiff enough to stay put. For extreme ultralight or camping on soft ground, can be trimmed for a super minimal pad.