Sea To Summit
Reactor Midweight Liner
Reactor Midweight Liner
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The Sea to Summit Reactor Midweight Fleece Liner is the versatile, go-to thermal boost for every adventure. Built from stretch-knit fleece with integrated armholes, it delivers exceptional freedom of movement whether you’re a side sleeper or a restless tosser-and-turner. It fits inside any sleeping bag and snaps into Sea to Summit bags for easier entry and exit.
Powered by Thermolite® Pro with Far Infrared (FIR) technology and hollow-core fibres, the Reactor Midweight efficiently traps and reflects body heat to increase warmth without unnecessary bulk—adding up to 6°C | 11°F when used as part of a sleep system.
Unlike a full sleeping bag, the liner is easy to clean and quick-drying. The HeiQ Fresh odour-control treatment helps it stay fresh during extended trips, while reducing how often you need to wash your sleeping bag—helping maintain loft and extend its usable life.
Features
Features
• Freedom to Move: Stretch-knit construction and armholes provide unrestricted comfort for any sleep position.
• Lightweight Thermal Boost: Thermolite® Pro with FIR and hollow-core fibres adds up to 6 °C | 11 °F warmth.
• Easy to Clean: Quick-drying and machine washable with HeiQ Fresh odour control treatment.
• Compatible Design: Fits all sleeping bags and snaps into Sea to Summit bags for secure positioning.
• Protects Your Sleeping Bag: Reduces washing frequency to maintain insulation loft and extend bag lifespan.
• Ideal for backpacking, hut trips, bikepacking, and travel where warmth and hygiene matter.
Specifications
Specifications
• Added Warmth: Up to 6°C
• Best Use: Backpacking, Camping & Winter Camping
• Comes With: Ultra-Sil stuff sack
• Materials: Thermolite Pro & Thermolite EcoMade
• Shape: Mummy
• Fits upto: 185cm
• Packed Size: 19cm
• Weight: 350g
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