I got a chipped foam Exped , It self inflates like a Therma rest . but is much thicker when it does .
Breath has moisture and mildew loves moisture .. I used the pump sack on my Irish trip
and the Stevenson Warmlight Down Air Mat took in moisture because it happened to be
at Dew Point when I did the inflation, and got a slow leak from the coating deterioration from the mildew..