Why It's CoolThe gaudy gray-and-orange patterns of the bag's nylon shell start to look pretty attractive when you remind yourself how little you forked over herethis is the biggest bang for the buck on the market. Fashioned with a taffeta lining and stuffed with DuPont Thermalite insulation, the 30-degree Super Guide delivered a cozy night's sleep in temps that hovered around freezing. » A zipper that runs up the center of the footbox (to mid-shin level) opens to reveal no-see-um nettinga clever screen window for ventilation. No more sweaty feet and legs on warm nights.Hmmm . . .The Super Guide is heftytwo pounds five ouncesand the shell and lining don't repel moisture quite as well as others.