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Optimized for minimal weight and maximum warmth, the Reactor Lightweight enhances sleep system performance with advanced Thermolite® Pro fabric, which uses infrared-absorbing ceramic pigments and hollow-core fibers to trap body heat. Adding up to 4°C|7°F of warmth with minimal bulk, it’s ideal for ultralight expeditions. Stretch-knit fabric and articulated arm openings ensure unrestricted mobility. Treated with HeiQ Fresh odor control, it’s quick-drying, machine washable, and helps prolong your sleeping bag’s lifespan by reducing wash frequency.

Lightweight and insulative, Thermolite® Pro technology with hollow-core fibers and infrared-absorbing pigments enhances warmth with minimal pack size
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Freedom to Move – Stretch-knit and shaped arm openings allow unrestricted movement, providing natural comfort throughout your sleep
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Technical Shape and Hood – Ergonomic design with a fitted hood delivers optimal warmth and comfort without extra weight or bulk
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Fits any sleeping bag - Stretch fabric means the Reactor Liner fits any shape of sleeping bag
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Stay Fresh Longer – HeiQ Fresh odor control technology keeps the liner fresh after extended use
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Sleep System Integration – Snap connectors at the shoulders easily pair with Sea to Summit sleeping bags for quick, hassle-free entry and exit
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Easy to Keep Clean – Machine washable construction simplifies care and reduces wear on your sleeping bag over time
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Lower Impact Materials – Crafted with certified recycled fibers and bluesign APPROVED materials to minimize environmental impact
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100% Post-Consumer Recycled Polyester
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Stuff Sack: 100% Polyester
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Dimensions: 81.1 x 31.5 in | 206 x 80 cm
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Packed Size: 3.9 x 7.1 x 3.9 in | 10 x 18 x 10 cm
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Weight: 9.5oz | 270g
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Reactor Lightweight Liner Long(Long / Pewter)

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