Nate Mendel (NOT signature)

Saw the Foos the other night. For one song, Nate played a bass I don't think I've ever seen before. Body vaguely shaped like a P, but with a slotted headstock (tuners on both sides, of course), and what looked like a very large pick guard (maybe even two different pieces, not sure) that covered most of the body, including most of the area from the bridge out to the end of the body (not someplace you'd normally be playing). Just curious, not something I've ever seen before. Anybody know what it is? I've Googled about his equipment and haven't found anything that looks like it's that particular instrument.

John