Short || Reactor Lightweight Sleeping Bag Liner

Short

Reactor Lightweight Sleeping Bag Liner

$64.95

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Size

Short
Regular
Long

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Highlights

Best UseBackpacking, Cycle touring, Paddle touring

Length70in | 178cm

Packed Weight8.7 oz | 248 g

Packed Size7 × 4 × 4 in | 18 × 10 × 10 cm

Performance

Weight

Ultralight
Lightweight
Midweight

Packability

Ultra Compact
Compact
Midsize

About The Product

Optimised 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 fibres 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 odour control, it’s quick-drying, machine washable, and helps prolong your sleeping bag’s lifespan by reducing wash frequency.

Product 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

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Reactor Lightweight Sleeping Bag Liner Short

Description || Reactor Lightweight Liner

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

Technical Features

HEIQ Fresh

Thermolite Pro

Thermolite Eco Made

Tech specs

Best Use

Backpacking, Cycle touring, Paddle touring
Materials

100% Post-Consumer Recycled Polyester; Stuff Sack: 100% Polyester

	Short	Regular	Long
Weight	235 g8.3 oz	255 g9.0 oz	270 g9.5 oz
Dimensions	178 × 80 cm70 × 31 in	193 × 80 cm76 × 31 in	206 × 80 cm81 × 31 in
Packed Size	18 × 10 × 10 cm7 × 4 × 4 in	18 × 10 × 10 cm7 × 4 × 4 in	18 × 10 × 10 cm7 × 4 × 4 in
Recommended User Height	170 cm66.93 in	185 cm72.83 in	198 cm77.95 in

Frequently Asked questions

How much warmth does a Reactor Lightweight add to a sleeping bag?

The added warmth depends on how well the sleeping bag retains heat and how well the sleeping pad insulates. When paired with a quality bag and mat, a Reactor Lightweight can add up to 4 °C / 7 °F.

Which Reactor is the warmest?

The Reactor Fleeceweight is the warmest option, followed by the Reactor Midweight, and then the Reactor Lightweight.

Can a Reactor be machine washed and dried?

Reactor liners can be machine washed without special soaps. Do not use fabric softeners. Air dry or machine dry on a cool to warm cycle without dryer sheets.

Can a Reactor Lightweight work as a stand-alone sleeping bag?

In summer temperatures and still air conditions, a Reactor Lightweight can function on its own for sleepers wearing long base layers. The fabric is not windproof.

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