DESC: Ideal for three-season backpacking and minimalist backcountry adventures, this lightweight and highly compressible Orion sleeping bag features warm synthetic Primaloft insulation that's comfort rated to 20F. The North Face used a special quilted layering construction that layers continuous sheets of Primaloft insulation in a quilted pattern that's stitched in alternate rows to the Orion's inner lining and outer shell. If that doesn't make sense, remember this--you don't get cold spots because the insulation doesn't move around or shift the way it does in conventionally woven bags. This means you stay warm throughout the night. Pack weight matters in the mountains, so The North Face used heat-transfer logos to eliminate the weight normally associated with embroidery threads. The Orion does have a zippered vent along the ergonomic vaulted footbox for cooling, but the foot circumference is a narrower 38-inch circumference than the 40-inch circumference found on many other sleeping bags ma