The Trail Pro Max is the choice for those who value comfort. When self-inflating pads first came onto the market years ago, no one would have even dreamed of a self-inflating pad this thick! Even so, for most users ready to sacrifice a bit of weight for a good night of sleep, its not too overly heavy. Since the pad's insulation is generous (its R-value is 4.4), its a carefree choice for three-season use and also works in light sub-zero temperatures. When you arrive at camp, take the Trail Pro Max out of its stuff sack, open the valve and let the foam return to its shapethis way the pad draws in almost all the air it needs by itself. Once the pad has done its job, you can blow in a little extra air and close the valve. - MAX model: traditional, rectangular, non-tapered - StrataCore construction and a stretchy surface fabric enhance comfort - The WingLock valve lets air flow three times faster than Thermarests previous valve - The fabrics are solution-dyed, which saves water an