Short || Reactor Fleeceweight Liner
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Short || Reactor Fleeceweight Liner
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Reactor Fleeceweight Sleeping Bag Liner Reactor Fleeceweight Sleeping Bag Liner Reactor Fleeceweight Sleeping Bag Liner Reactor Fleeceweight Sleeping Bag Liner
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Short || Reactor Fleeceweight Liner
Short
Short || Reactor Fleeceweight Liner
Short
Reactor Fleeceweight Sleeping Bag Liner Reactor Fleeceweight Sleeping Bag Liner Reactor Fleeceweight Sleeping Bag Liner Reactor Fleeceweight Sleeping Bag Liner
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Reactor Fleeceweight Sleeping Bag Liner

€79,95
  • Size

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Highlights

Best Use: Cold-weather backpacking, Ski touring, (Stand-alone) summer use

Type: Thermal Liner

Weight: 12.9oz | 365g

Length: 70.1in | 178cm

Packed Size: 5.9 x 9.8 x 5.9 in | 25 x 15 x 15 cm

Performance
Weight
  • Ultralight
  • Lightweight
  • Midweight
Packability
  • Ultra Compact
  • Compact
  • Midsize
Climate
  • Warm
  • Cold
  • Extreme Cold
About The Product

Boost your sleep system’s warmth with the Reactor Fleeceweight. Thermolite® hollow-core fibres and grid fleece trap and reflect body heat, adding up to 8°C|14°F with minimal weight. The stretch fleece and arm openings allow freedom of movement, while snap attachments fit Sea to Summit sleeping bags for easy access. Easy to clean and quick-drying, it features HeiQ Fresh odour control. Using a liner reduces sleeping bag washes, helping preserve loft and extend lifespan.

Features

  • Boosts Sleep System Warmth – Reactor Fleeceweight uses Thermolite® hollow-core fibres and grid fleece to trap warmth with minimal added weight
  • 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 minimise environmental impact
  • Can be used on its own as a lightweight sleeping bag in warm-weather conditions
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.

Short || Reactor Fleeceweight Liner

Reactor Fleeceweight Sleeping Bag Liner Short

Short || Reactor Fleeceweight Liner

Reactor Fleeceweight Sleeping Bag Liner Short

Reactor Fleeceweight Liner

Boost your sleep system’s warmth with the Reactor Fleeceweight. Thermolite® hollow-core fibres and grid fleece trap and reflect body heat, adding up to 8°C|14°F with minimal weight. The stretch fleece and arm openings allow freedom of movement, while snap attachments fit Sea to Summit sleeping bags for easy access. Easy to clean and quick-drying, it features HeiQ Fresh odour control. Using a liner reduces sleeping bag washes, helping preserve loft and extend lifespan.

Features

  • Boosts Sleep System Warmth – Reactor Fleeceweight uses Thermolite® hollow-core fibres and grid fleece to trap warmth with minimal added weight
  • 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 minimise environmental impact
  • Can be used on its own as a lightweight sleeping bag in warm-weather conditions

Tech specs

  • Best Use
    Cold-weather backpacking, Ski touring, (Stand-alone) summer use
  • Material(s)
    100% Post-Consumer Recycled Polyester; Stuff Sack: 100% Polyester
Short Regular Long
Short
Regular
Long
Weight12.9 oz 365 g14.1 oz 400 g15.2 oz 430 g
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 Size5.9 x 9.8 x 5.9 in 15 x 25 x 15 cm5.9 x 9.8 x 5.9 in 15 x 25 x 15 cm5.9 x 9.8 x 5.9 in 15 x 25 x 15 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 Fleeceweight add to a sleeping bag?

The added warmth depends on how well the sleeping bag retains heat and how well the sleeping mat insulates. When paired with a quality bag and mat, a Reactor Fleeceweight can add up to 8 °C / 14 °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 Fleeceweight be used for backpacking or biking?

For bikepacking with frame bags or ultralight backpacking, the Reactor Fleeceweight is likely too bulky. Larger winter camping backpacks generally offer enough space.

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.

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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