With a mummy shape and Thermolite Pro fabric, the regular Sea to Summit Reactor Extreme Liner featuring a drawcord uses new infrared technology paired with comfortable stretch fabric to add warmth, versatility, and increased insulation. The Reactor Extreme feature offers additional heat retention best suited to cold conditions.

Thermal boost to retain heat and warmth. As the core of your sleep system the Reactor liner extends the performance of your sleeping bag and sleeping mat in the coldest of conditions
Thermolite® Pro technology using knitted, hollow-core fibres and infrared-absorbing ceramic pigments to reflect your body's heat back for enhanced warmth and comfort
Drawcord footbox and shoulder openings can be opened or closed for optimal comfort and integrates perfectly with the footbox of our Free-Flow Zip system in select Sea to Summit sleeping bags
HeiQ Fresh odour control technology helps keep the liner fresh even after extended use
Knitted fabric provides incredible stretch and freedom of movement in this mummy-shaped liner and works perfectly with sleeping bags of any shape

Sea To Summit Reactor Extreme Sleeping Bag Liner - 2 Sizes