Reactor Lightweight Liner

The Sea to Summit Reactor Lightweight Liner increases your sleeping bag’s warmth with minimal added weight. Designed for versatility and comfort, it features a stretch-knit Thermolite® Pro fabric that moves with you as you sleep, while integrated armholes provide complete freedom of movement for unrestricted rest.

The liner fits easily inside any sleeping bag and snaps into compatible Sea to Summit bags for secure placement and effortless entry and exit. Using Far Infrared (FIR) technology and hollow-core fibres, Thermolite® Pro traps and reflects body heat, boosting warmth by up to 4 °C | 7 °F without adding bulk or weight.

With HeiQ Fresh odour control and quick-drying performance, the Reactor Lightweight Liner stays fresh and easy to maintain on extended trips. It also helps extend the lifespan of your sleeping bag by reducing the need for frequent washing, keeping insulation loft and performance intact for longer.