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Sea to Summit

Sea to Summit Reactor Midweight Liner (2026)

Sea to Summit Reactor Midweight Liner (2026)

$119.95 CAD
$119.95 CAD
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Shipping calculated at checkout.
Size

Add extra warmth to your sleeping bag without adding unnecessary bulk with the Sea to Summit Reactor Midweight Sleeping Bag Liner. Made with THERMOLITE® Pro fabric, infrared-absorbing ceramic pigments, and hollow-core fibres, it traps and reflects body heat to add up to 6°C (11°F) of warmth to your sleep system.

The stretch-knit fabric and shaped arm openings allow unrestricted movement while you sleep, making the liner comfortable in a wide range of sleeping bags and sleep systems. An ergonomic hood provides additional warmth, while snap connectors at the shoulders make it easy to attach to compatible Sea to Summit sleeping bags.

Designed for backpacking, camping, cycle touring, and paddle touring, the Reactor Midweight is quick-drying, machine washable, and treated with HeiQ Fresh odour control to help keep it fresh between washes. Using a sleeping bag liner also reduces the need to wash your sleeping bag as often, helping protect its insulation and extend its lifespan.

Features

- Boosts Sleep System Warmth – Thermolite® Pro uses Far Infrared technology and hollow-core fibres to trap and reflect body heat without extra bulk
- Freedom to Move – Stretch-knit and shaped arm openings allow unrestricted movement, providing natural comfort throughout your sleep
- Technical Shape and Hood – Ergonomic design with a fitted hood delivers optimal warmth and comfort without extra weight or bulk
- Stay Fresh Longer – HeiQ Fresh odour control technology keeps the liner fresh after extended use
- Sleep System Integration – Snap connectors at the shoulders easily pair with Sea to Summit sleeping bags for quick, hassle-free entry and exit
- Easy to Keep Clean – Machine washable construction simplifies care and reduces wear on your sleeping bag over time
- Lower Impact Materials – Crafted with certified recycled fibres and bluesign APPROVED materials to minimize environmental impact

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