Short || Reactor Lightweight Liner
Short
Short || Reactor Lightweight Liner
Short
Reactor Lightweight Sleeping Bag Liner Reactor Lightweight Sleeping Bag Liner Reactor Lightweight Sleeping Bag Liner Reactor Lightweight Sleeping Bag Liner
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Short || Reactor Lightweight Liner
Short
Short || Reactor Lightweight Liner
Short
Reactor Lightweight Sleeping Bag Liner Reactor Lightweight Sleeping Bag Liner Reactor Lightweight Sleeping Bag Liner Reactor Lightweight Sleeping Bag Liner Reactor Lightweight Sleeping Bag Liner Reactor Lightweight Sleeping Bag Liner Reactor Lightweight Sleeping Bag Liner
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Reactor Lightweight Sleeping Bag Liner

€54,95
  • Size

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Highlights

Best Use: Backpacking, Cycle touring, Paddle touring

Type: Thermal Liner

Weight: 8.3oz | 235g

Length: 70.1in | 178cm

Packed Size: 3.9 x 7.1 x 3.9in | 18 x 10 x 10 cm

Performance
Weight
  • Ultralight
  • Lightweight
  • Midweight
Packability
  • Ultra Compact
  • Compact
  • Midsize
Climate
  • Warm
  • Cold
  • Extreme Cold
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.

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
Product Features

Learn more

Shipping & Returns

We use climate-neutral shipping:

  • DHL GoGreen for orders to Germany, Austria, France, Italy and Czech Republic and
  • GLS Klima Protect for orders to Belgium, Denmark, the Netherlands, Luxembourg, Sweden, Switzerand and Norway.

All orders are usually shipped within 48 hours.

Delivery time can take up to 3 working days Germany-wide, 4 working days for orders to AT, BE, CZ, DK, FR, IT, LU, NL & SE and 6 working days for orders to CH & NO and depends on the shipping service provider.

Shipping cost:

  • Germany: For orders with a value below 100€ we charge a shipping fee of 4,95€. We do not charge shipping fees for orders with a value over 100€.
  • France, Italy, Austria, Belgium & Netherlands: For orders with a value below 100€ we charge a shipping fee of 9,99€. We do not charge shipping fees for orders with a value over 100€.
  • Luxembourg: We charge a shipping fee of 9,99€ for all orders.
  • Czech Republic: We charge a shipping fee of 14,99€ for all orders.
  • Denmark: We charge a shipping fee of 75 DKK for all orders.
  • Norway: We charge a shipping fee of 599 NOK for all orders.
  • Sweden: We charge a shipping fee of 219 SEK for all orders.
  • Switzerland: We charge a shipping fee of 29 CHF for all orders.

All orders can be returned within 14 days of purchase. However, for the sake of the environment, please make sure to keep returns as low as possible.

Pair it with

Reactor Lightweight Sleeping Bag Liner

Reactor Lightweight Sleeping Bag Liner Short

Reactor Lightweight Sleeping Bag Liner

Reactor Lightweight Sleeping Bag Liner Short

Reactor Lightweight Liner

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.

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

Tech specs

  • Best Use
    Backpacking, Cycle touring, Paddle touring
  • Material(s)
    100% Post-Consumer Recycled Polyester; Stuff Sack: 100% Polyester
Short Regular Long
Short
Regular
Long
Weight8.3 oz 235g9.0 oz 255g9.5 oz 270g
Dimensions70.1 x 31.5 in 178 x 80 cm76.0 x 31.5 in 193 x 80 cm81.1 x 31.5 in 206 x 80 cm
Packed Size3.9 x 7.1 x 3.9 in 10 x 18 x 10 cm3.9 x 7.1 x 3.9 in 10 x 18 x 10 cm3.9 x 7.1 x 3.9 in 10 x 18 x 10 cm
Fits Up To Height5 ft 6 in 170 cm6 ft 185 cm6 ft 6 in 198 cm

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 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.

Shipping & Returns

We use climate-neutral shipping:

  • DHL GoGreen for orders to Germany, Austria, France, Italy and Czech Republic and
  • GLS Klima Protect for orders to Belgium, Denmark, the Netherlands, Luxembourg, Norway, Sweden and Switzerland.

All orders are usually shipped within 48 hours. 

Delivery time can take up to 3 working days Germany-wide, 4 working days for orders to AT, BE, CZ, DK, FR, IT, LU, SE and NL and 6 working days for orders to CH and NO and depends on the shipping service provider.

Shipping cost:

  • Germany: For orders with a value below 100€ we charge a shipping fee of 4,95€. We do not charge shipping fees for orders with a value over 100€.
  • France, Italy, Austria, Belgium & Netherlands: For orders with a value below 100€ we charge a shipping fee of 9,99€. We do not charge shipping fees for orders with a value over 100€.
  • Luxembourg: We charge a shipping fee of 9,99€ for all orders.
  • Czech Republic: We charge a shipping fee of 14,99€ for all orders.
  • Denmark: We charge a shipping fee of 75 DKK for all orders.
  • Norway: We charge a shipping fee of 599 NOK for all orders.
  • Sweden: We charge a shipping fee of 219 SEK for all orders.
  • Switzerland: We charge a shipping fee of 29 CHF for all orders.

UPS Express shipping cost (only GER):

  • Next weekday delivery if ordered by 1 PM for 19,95€

All orders can be returned within 14 days of purchase. However, for the sake of the environment, please make sure to keep returns as low as possible.

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