Thomas H. wrote a review of Big Agnes Two Track Pad - Mummy on November 18, 2008
We purchased this pad to be used with the Horse Thief and Zirkel SL bags. The reason we went with the -25 pad is to be used in a Hennessey Hammock for insulation purposes. It worked great. I had to let some air out during the night (very east to do while in the bag) for comfort adjustment. I left them inflated for over three days to see if it would leak down. It did not lose any noticeable pressure. Good quality. If you need a pad to sleep on a concrete slab (cushion) or hammock (insulation) this is the one to get.