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 less
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