Sea to Summit Reactor Sleeping Bag Liner

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The Reactor Sleeping Bag Liners add warmth to your sleep system in cool and cold conditions without the need for extra layers or heavy fabrics. They are made with Thermolite® Pro infra red-absorbing ceramic pigments and ThermoLite® EcoMade fibres to take thermal performance to the next level. The fabric is stretchy and fits any sleeping bag shape. The Mummy with drawcord option has shoulder and footbox openings for ventilation and the option to walk around in it if needed.


  • Reactor liners provide a thermal boost to retain heat and warmth. As the core of your sleep system the Reactor liner extends the performance of your sleeping bag in colder conditions.
  • Fabric is a blend of 50/50 blend of ThermoLite® Pro and 100% recycled ThermoLite® EcoMade and uses infrared technology for increased insulation
  • ThermoLite® Pro technology uses knitted, hollow-core fibres and infrared-absorbing ceramic pigments to reflect your body's heat back for enhanced warmth and comfort
  • Knitted fabric provides incredible stretch and freedom of movement and these liners work perfectly with sleeping bags of any shape
  • The classic Mummy version has practical openings in the shoulders to allow you user to stretch your arms out
  • Mummy (Drawcord) version has a drawcord footbox for optimal comfort:
    • The drawcord footbox and shoulder openings integrate perfectly with the Free-Flow Zip system in select Sea to Summit sleeping bags
    • Open the base drawcord, and you can hitch the liner up and walk - perfect for bathroom breaks
  • HeiQ Fresh odour control technology helps keep the liner fresh even after extended use
  • Keeps sleeping bag clean on the inside
  • Comes with an Ultra-sil stuff sack


Length 206cm (Mummy), 216cm (Mummy (Drawcord))
Shoulder Width 80cm (both)
Foot Width 55cm (both)
Rolled Size 15 x 7 x 11cm (both)
Average Weight 265g (Mummy), 284g (Mummy (Drawcord))
Made From 50% Thermolite® Pro Yarn, 50% Thermolite® EcoMade yarn

Thermolite® Pro: offers an extra thermal boost for warmth and comfort in cold conditions. Thermolite® Pro far infrared fibre (FIR) technology is a lightweight, hollow fibre with special ceramic pigments that generate warmth for your body. Liners made with FIR fibre are more efficient at absorbing the far infrared rays emitted by your body and reflecting them back to you. This heat transfer by re-radiation effectively improves your body's heat retention.

ThermoLite® EcoMade: is a sustainably made material that offers an insulation effect for an added thermal boost. Thermolite® EcoMade employs the tried-and-tested performance of hollow-core Thermolite yarn and is made with 100% recycled resources. Hollow core fibres trap air, provide insulation and wick moisture to the outside of the fabric where it can dry quickly. Plastic bottles are collected, cleaned, and ground up into flakes. They are then converted into chips, spun into fibre and yarn, and finally, woven into your liner. GRS-certified (Global Recycled Standard) and offer the same quality and durable lightweight warmth as their polymer virgin counterparts but with a lower carbon footprint.

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


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