DESC: Big Agnes products are synonymous with comfort. Instead of a traditional sleeping bag on top of your pad, you just slide your pad into a sleeve on the bottom of your bag, and the top 2/3 of the bag is insulated like a traditional bag. No more rolling off your pad! Polarguard Delta synthetic insulation provides warmth even when wet; A-Flex construction eliminates gapping and provides more air pockets than traditional construction. No-draft yoke seals around neck and draft free zipper tube insulates along the length of the zipper. Built in pillow pocket holds a fleece or camp pillow. No-draft wedge insulates the connection between the bag and pad. Mate together any left and right zip bags with a 70" YKK #8 zipper. Rectangular shape offers more room in foot box and shoulders. Big Agnes,Therm-a-Rest, or any 20 x 78 in. sleeping pad is compatible. May be compressed to 8 x 9.5 in. using a separate compression sack.