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First Ascent Thermolite Heating Liner

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The Thermolite sleeping bag liner is specially designed for extreme environments as it adds up to 15°C of warmth to a sleeping bag.


  • Adds up to 15°C warmth to the temperature rating on your sleeping bag
  • Most effective on bags with a comfort rating of 0°C or le
  • Permanent thermal insulation qualities
  • Excellent warmth to weight ratio
  • Lightweight and packs down to a small size
  • The fibre is breathable and keeps you warm, dry and comfortable
  • The mummy sheet has a cowl to match your bag, and ties allow you to secure the sheet to the bag


  • Weight: 325 g
  • Dimensions: 210 x 90 cm
  • Material(s): Thermolite by DuPont