The circuit has an internal foam frame, maybe this is similar to the effect of your ccf closed cell foam sit pad? It's comfy to sit on anyway.
Okay, Frye has me shopping for a headlamp. The zebralight looks nice, but I'd like something rechargeable via usb so it's compatible with my battery system, like this:
http://www.petzl.com/en/Sport/PERFOR...S#.VOghY1PF9v4
... but I know nothing about good vs bad headlamp brands, if someone wants to point me to a product -- or a thread about usb/rechargeable headlamps.
Thnx again for any advice!