With a mummy shape and Thermolite®Pro fabric, the Reactor Liner uses new infrared technology paired with comfortable stretch fabric to offer extra warmth, versatility, and increased insulation. The drawcord offers added flexibility for premium comfort. Best suited to cold conditions. The REACTOR adds up to 6oC of warmth to a sleeping bag or can be used alone as a warm weather bag.

The evolved collection has been created by industry leading designers to offer premium liners suited to a range of climates, conditions, and adventures.

Add up to 12% thermal boost to your sleeping bag

Maximum User Height 198cm / 78in

Weight 265g

Thermolite Pro has engineered hollow fibres like standard Thermolite but with the addition of permanent ceramic pigments that absorb the body's infrared rays and reflect them back to the wearer.

The recycled Thermolite EcoMade fibers are made from 100% textile waste, are GRS-certified, and offer the same quality and durable lightweight warmth as their polymer virgin counterparts but with a lower carbon footprint.

Sea to Summit Liners are treated with HeiQ Fresh FFL, a biocide-free, highly effective odor control technology that uses a bio-based Amino Sugar Polymer to neutralise body odour