I have lumbar probs and have had quite an education in various pads/mats. For my back it seems the closed cell are best, S/I's second and air mats are the worst. I don't understand how folks with back probs rave about air mats.
ps.... My experience has settled me with the ridgerest deluxe. I sleep on them every night at home, also.
_________________________
...ask for the old paths, where is the good way, and walk therein... (Jeremiah)