Air chambered pad from Big Agnes offer you unprecedented lightweight, compact, options for quite frankly, one of the most comfortable sleeps that you will have away from your own bed. Our most popular style, the Insulate Air Core, is also the most versatile 3-season pad available today. What makes it so versatile is that we laminate a layer of PrimaLoft to the top layer of the pad. When you use this face up this pad will provide good insulation down to 15 degrees, but not on frozen ground as there is still too much air underneath to risk the cold coming off of snow or ice. What makes this pad so versatile is that during the summertime or in really hot climates when what you are really trying to do is get rid of body heat, when you are laying on top of your sleeping bag instead of in your sleeping bag. This is the only pad on the market that you can flip upside-down; some people call this the upside down pad. Now the PrimaLoft is against the ground reducing some of the radiant heat from coming off the ground but it also gives you an inch and a half of open air underneath, almost a heat sync where body heat can escape.