Duplicate your at-home sleep experience in the outdoors - take comfort anywhere! MegaSleep 25/40 is a roomy, rectangular 3-season sleeping bag for car camping and backpacking. On one side, more layers of insulation, when placed over the top of the sleeper, provide a temperature rating of 25F for cooler nights. The other side, with a little less insulation, is just right for warm summer nights with a rating of 40F. MegaSleep 25/40 is designed to fit the EXPED MegaMat for an at-home sleep experience anywhere, but due to its lightweight and compressible materials it can be carried in a backpack as well. It quickly and easily unzips to become a plush blanket for unrestricted sleeping. MegaSleep 25/40 can also be zipped together with another MegaSleep 25/40 to create a roomy couples sleeping bag.