You are going on extreme adventures, in very cold conditions, the Alpine -29°C sleeping bag is the down you need, it will keep you warm! 1459 grams for this sleeping bag with Ultra-Dry down, giving very good water resistance in wet conditions. The waterproof features of premium recycled 10D nylon also provide additional protection and prevent exposure to condensation, for greater outdoor comfort. The Free Flow zipper system has been modified by removing the footbox zipper to retain maximum warmth. The double collar and draft tube provide optimal heat retention for increased comfort and warmth in arctic and cold conditions. Main zipper - full length with zipper guard and two sliders. Secondary zipper - 1/3 length with zipper guard and two sliders.

Characteristics of the Alpine -29°C extreme cold sleeping bag from Sea To Summit:

• Temperatures: Standard EN13537
• Comfort temperature: -19°C Temperature at which a woman can sleep comfortably.
• Comfort limit temperature: -29°C Temperature at which a man can sleep comfortably for 8 hours
• Extreme temperature: -54°C Temperature at which after 4 hours a woman will feel a sensation of cold which can lead to frostbite and/or hypothermia.
• Mummy form
• RDS 850+ Cuin Down
• Filling weight in regular : 1000 g
  
• Filling weight lengthwise : 1135 g
• Exterior materials: 100% recycled 20D polyester
  
• Interior materials: 100% recycled 20D Polyester
• Vertical padding cuffs at chest level to prevent the down from moving and ensure consistent protection
• Regular Weight: 1560 g - Long Weight: 1760 g
  
• Regular Dimensions: 198 cm for a maximum person of 185 cm
• Regular shoulder dimensions: 160 cm circumference
• Regular foot area: 122 cm circumference
• Dimensions Long: 225 cm for a maximum person of 198 cm
• Dimensions shoulders long: 170 cm circumference
• Long foot area: 132 cm circumference
• Compressed packaged: Regular: 25 x 30 cm - Long: 25 x 34 cm