When my boys did the JMT, they used a thermarest ... if the link works, it was this pad. It has some foam and partially inflates itself, then you add the last few puffs.
They got a few holes in them, repaired them, and continued to use them, although both have slow leaks.
I have looked at Klymit, Big Agnes, and other Therm-a-rests. Some are just foam pads, some only air, many a combination of both. So many to choose from. What do you find works?