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Designed for efficient warmth during frigid winter nights in the backcountry, this synthetic zero-degree mummy bag features our Cyclone design to maximize warmth and compressibility while reducing weight.


  • 5-degree, synthetic bag for mountaineering and cold-weather backpacking
  • Cyclone construction wraps continuous-filament and cut-staple insulation around the bag in compressible vertical baffles
  • Shaped hood for more warmth and comfort
  • Draft collar for comfort and to prevent heat loss
  • Pad loops for attaching the bag to a sleeping pad
  • Compression sack and storage sack included

Product Specifications

Temperature Rating:
Heatseeker Pro
Fill Weight:
Short: 2 lbs 14 oz (1304 g) Reg: 3 lb 4 oz (1474 g) Long: 3 lb 10oz (1644 g)
Total Weight:
Short: 3 lbs 13 oz (1729 g) Reg: 4 lb 3 oz (1899 g) Long: 4 lb 9oz (2070 g)
Stuffed Volume:
11" x 20" (20 cm x 50.8 cm)
Fits Up To (IN.):
Short: 5' 6" (168 cm) Reg: 6' (183 cm) Long: 6'6" (198 cm)
Shoulder Circ:
Short: 60" (152 cm) Reg: 61" (155 cm) Long: 62" (157 cm)

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