Sea to Summit Thermolite Reactor

Sea to Summit Thermolite Reactor

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Our most popular sleeping bag liner! The Reactor is made from 80g/m² THERMOLITE®—the lightest weight THERMOLITE® fabric available. THERMOLITE® is a hollow core fibre that provides amazing warmth for its weight and remains extremely breathable. The Reactor adds up to 8°C of warmth to your sleeping bag or can be used alone as a warm weather bag.


• Lighter weight, more packable than fleece
• Mummy shape with a box foot
• Drawcord hood with mini cord lock
• Extends life of sleeping bags by keeping them clean
• Contrasting colour along the top edge makes it easier to find the opening
• Adds warmth to a sleeping bag
• Packs into its own UltraSil® stuff sack
• Machine washable


• Length: 210cm/83in
• Width: 90cm/35in
• Weight: 248g/8.7oz

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