Thermolite liners offer a way to increase the temperature rating of your sleeping bag without adding much bulk to your kit. This Sea to Summit Reactor liner uses 50% Thermolite Pro fibre and 50% Thermolite EcoMade fibre to create an incredibly comfortable liner that is also eco friendly.
Using Test Standard ASTMD1518-2014 for heat transfer this sleeping bag liner has been tested to prove it can add a thermal boost of up to 6% in a 3 season bag and 12% in a 1 season bag.