These used military issue sleeping pads are made by Thermarest Cascade Designs who has been the leader in this field made in the U.S.A.  Manufactured of open cell foam with a waterproof durable shell that inflates upon opening.  Self inflating sleeping pads are more comfortable and insulate you from the ground all while being very compact. It's a great addition to save your back and your budget.
 
Features & Specs:
20" X 72 " x 1"
Self inflating,  Just open the valve. The pad will inflate to neutral atmospheric pressure. Once inflated, close valve.
Genuine U.S. Military Issue