Sea to Summit Reactor Fleece Sleeping Bag Liner

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The Reactor Fleece Sleeping Bag Liners are Sea to Summit's warmest sleeping bag liners and the core of any quality cold weather sleep system or to use as a stand alone option in warmer conditions. They are built from hollow-core Thermolite® Pro fibres used in a grid-pattern and feature shoulder zips and a drawcord footbox for ventilation, integration with the Free Flow Zips system on select Sea to Summit bags and provides the option to walk around in it if needed.


  • 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
  • Hollow-core ThermoLite® EcoMade All Season fibres are used in a grid-pattern fleece for maximum warmth retention
  • The Mummy shape is designed for maximum thermal efficiency and includes shoulder zips and footbox drawcord for additional temperature regulation and 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
  • Can be used as a stand-alone system for warm-weather adventures


Length 216cm (Mummy (Drawcord))
Width 80cm (Mummy (Drawcord))
Shoulder Width 80cm (Mummy (Drawcord))
Foot Width 55cm (Mummy (Drawcord))
Rolled Size 25 x 9 x 14cm (Mummy (Drawcord))
Average Weight 420g (Mummy (Drawcord))
Made From 60% Thermolite® EcoMade All Season yarn, 40% polyester yarn

Thermolite® EcoMade All Season: technology uses a combination of fibres to help regulate temperature for premium comfort in both warm and cool conditions. In addition, the fibre is made from 100% post-consumer recycled resources. The insulation is made with heat-trapping hollow core fibres and moisture-wicking channel fibres for adaptive temperature management. It offers year-round comfort for multi-seasonal functionality.

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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