x3 on this until I sold the Springbar for a Globetrotter. I also used a thermarest on the cot for a little add'l insulation on cooler/cold nights. Cots aren't as bad as an uninsulated air mattress, but cold air circulates under the cot and the thermarest was great insulation and just a little added padding on the cot too!
Good point, and perhaps one of those rollup yoga pads or exercise pads I saw at the AmVets Thrift Store would fit better as an insulating pad between a cot and a "fartsack" (as it is known in the USA INF). Many of the rollup yoga or exercise pads were virtually brand-new, and the AmVets folks priced them at $6 to $8 each, which I thought was a pretty good value for someone looking for a streamlined yet thick and comfortable sleeping pad, 10-4??? And some of those pads were cut down a bit in size, meaning they would fit NICELY atop a cot and between that cot and the camper's fartsack, yeah??? Just my $.02, for what it's worth, and maybe that ain't so much... unless you've been in the field all your life, as I have, and are actively looking for ways to save money.