Choose this ultra-warm, synthetic-filled bag for arctic expeditions, high-altitude climbing or whenever you need a bag for harsh, sub-zero conditions FILL. Polarguard Delta polyester. TEMPERATURE RATING (F). -40 degrees Fahrenheit

• Polarguard® Delta offers 10% more loft and 12% less weight than Polarguard 3D insulation”so it's warmer, lighter and more compressible
• Overlapping shingle construction distributes insulation evenly and keeps it from moving around so there are no cold spots
• Top shell features extremely lightweight, wind- and water-resistant Firestorm fabric; taffeta bottom shell defends against grit/abrasion
• Silken lining is soft against the skin and tightly woven for durability
• Full-length draft tube and adjustable synthetic-filled draft collar with microfleece cord tunnel keeps you toasty warm inside
• Packcloth-lined zipper columns provide smooth, snag-free zipper operation; zippers feature easy-grab pull tabs
• Head-level watch pocket ensures that alarm will be heard
• External pillow pocket can be stuffed with clothes to make a cozy pillow, or bag can be tucked away in the pocket during the day
• Nylon/mesh storage bag and nylon stuff sack included