I've tried the following:

- Thermarest Neoair Xtherm (Large)
- Sea To Summit Ether Light XT
- Klymit Static V Luxe Insulated
- Klymit Static V Luxe Insulated SL

They all did ok, but I'm still searching for the -perfect- mattress for this use case.

The main requirements for me:

- Keeps the hammock as flat as possible
- Has enough insulation to forego a downquilt most of the year
- Isn't too noisy when shifting around
- Large enough not to shift around inside the hammock (25-30" based on my experience)

Would love to hear some opinions from fellow DL Ridgerunner users, especially on rectangular pads, which I haven't tried yet. Cheers!