Thermarest Z Lite SOL Sleeping Pad

The accordion folding design sets up in seconds and packs down flat against my pack without eating any space. It's firm enough that I actually sleep through the night instead of tossing around. For the weight, I don't think anything else comes close.

Slept on this for four nights in the Rockies and the egg-crate texture actually kept my hips off the hard ground. It's light enough that I stopped noticing it strapped to my pack. Folds up fast when I'm breaking camp in the rain.

Slept on this for three nights in the Rockies and barely noticed the cold coming up through the ground. The reflective layer really does seem to make a difference compared to my old plain foam pad, and it's light enough that I stopped resenting the space it takes up on my pack.