The Pro Lite is Therm-A-Rests lightest, self-inflating 3 season mat. Just undo the valve & let the foam bounce back to its original form. The core is made from Therm-A-Rests new proprietary Atmos foam; it is lighter weight, more compressible & bounces back even quicker with better loft. Saying that however, you will always need to fine tune your mat for your own comfort. The Atmos foam is sandwiched between two super tough, 50 denier mini hex polyester fabric layers, so you can sleep soundly knowing you mat is good on any outdoor surface. However if you do manage to get a puncture we also sell the Permanent Home Repair Kit. The Pro Lite is great if you are looking for lightweight warmth & comfort. Lightweight Atmos foam Tough Compact Comfortable Self-inflatable