Mountain Hardwear says:
A mission-critical piece designed for high-altitude expeditions and the most bone-chilling conditions on Earth, the Phantom%E2%84%A2 GORE-TEX -40%C2%B0 is our most protective sleeping bag yet. Take shelter from hardcore mountain conditions in its ultra-warm, weather-resistant cocoon. You won't want to leave, but with light and compressible materials that make it easy to move camp, you can get closer to your summit.
Current Retail: $899.95-$930.00
Historic Range: $899.95-$930.00