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Sea to Summit

Sea to Summit Reactor Lightweight Liner (2026)

Sea to Summit Reactor Lightweight Liner (2026)

$99.95 CAD
$99.95 CAD
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Shipping calculated at checkout.
Size

Designed for ultralight backpacking and cold-weather adventures, the Sea to Summit Reactor Lightweight Sleeping Bag Liner adds warmth to your sleep system without adding unnecessary weight or bulk. Made with advanced THERMOLITE® Pro fabric, it uses infrared-absorbing ceramic pigments and hollow-core fibres to trap and retain body heat, adding up to 4°C (7°F) of warmth.

The stretch-knit fabric and articulated arm openings provide unrestricted movement and comfortable mobility while you sleep. Lightweight and packable, it’s an ideal choice for ultralight expeditions, backpacking, hiking, and camping where every gram matters.

Treated with HeiQ Fresh odour control, the Reactor Lightweight helps keep the liner fresh during extended trips. It’s also quick-drying and machine washable for easy care. Using a sleeping bag liner helps reduce how often you need to wash your sleeping bag, protecting its insulation and helping extend its lifespan.

Features

- Lightweight and insulative, Thermolite® Pro technology with hollow-core fibres and infrared-absorbing pigments enhances warmth with minimal pack size
- 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
- Fits any sleeping bag - Stretch fabirc means the Reactor Liner fits any shape of sleeping bag
- 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 minimise environmental impact

Specifications

'Regular' length: 193cm | 76in
'Long' length: 206cm | 81in

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