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The Reactor Midweight Liner is a versatile thermal boost designed to enhance your sleep system with advanced Thermolite® Pro fabric.
The Reactor Midweight Liner is a versatile thermal boost designed to enhance your sleep system with advanced Thermolite® Pro fabric.
Sea To Summit

Sea To Summit Reactor Midweight Sleeping Bag Liner Regular in Beluga

$79.95
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Preorder

With Pre-Order, you can purchase the latest items added to our store in advance of them arriving with us.

Your Pre-Order is prioritized (at no additional charge); meaning that as soon as the product arrives with us, we can wrap it straight back up; ready for collection via Click & Collect or dispatch to you — it often never even hits the stock room shelves!

Prelaunch

With Prelaunch, the date when we expect to receive the product ourselves is still a little too hazy to be confident in accepting Preorders.

So, instead, you can submit your email address for the item you are interested in, and we will email you as soon as stock arrives in the system.

Estimated Delivery & Collection Dates

Estimated Delivery & Collection Dates are given on Pre-Order and Pre-Launch products. They are for indicative purposes only and can change at any time without notice.

The dates we provide are based on information given by our suppliers. Whenever we get updated information from our suppliers we will endeavor to update the Estimated Delivery & Collection Dates provided on product pages.

We estimate this will be ready for dispatch to you or collection via Click & Collect on Undetermined

Sea To Summit Reactor Midweight Sleeping Bag Liner Regular in Beluga

Season:FA26

Brand:Sea To Summit

Code:533-BEL

The Reactor Midweight Liner is a versatile thermal boost for every adventure, designed to enhance your sleep system with advanced Thermolite® Pro fabric.

Built from stretch-knit fleece with integrated armholes, it delivers exceptional freedom of movement for any sleep position. It fits inside any sleeping bag and snaps into Sea to Summit bags for easier entry and exit. Powered by Thermolite® Pro with Far Infrared (FIR) technology and hollow-core fibers, the liner efficiently traps and reflects body heat to increase warmth by up to 6°C | 11°F without unnecessary bulk.

The quick-drying fabric features HeiQ Fresh odor-control treatment to help it stay fresh during extended trips, while reducing the frequency of washing to help maintain loft and extend the sleeping bag's usable life. The ergonomic design with a fitted hood delivers optimal warmth and comfort, while the construction uses certified recycled fibers and bluesign® APPROVED materials to minimize environmental impact.

Features:

  • Freedom to Move: Stretch-knit construction and armholes allow unrestricted movement in any sleep position.
  • Thermal Boost: Thermolite® Pro with FIR and hollow-core fibers traps and reflects heat, adding up to 6°C | 11°F to your system.
  • Easy to Clean: Quick-drying fabric with HeiQ Fresh odor control for extended freshness on multi-day trips.
  • Bag Compatibility: Fits any sleeping bag and snaps into Sea to Summit bags for easier entry and exit.
  • Extend Bag Lifespan: Reduces the need for frequent washing, maintaining insulation loft over time.
  • Weight: 355g.
  • Max User Height: 198cm.
  • Technical Shape and Hood: Ergonomic design with a fitted hood delivers optimal warmth and comfort.
  • Lower Impact Materials: Crafted with certified recycled fibers and bluesign® APPROVED materials.
Technical Information
  • Added Warmth
    Up to 6°C | 11°F
  • Best Use
    Backpacking, Camping, Winter Camping, Cycle touring, Paddle touring
  • Comes With
    Ultra-Sil stuff sack
  • Material
    Thermolite Pro, Thermolite EcoMade, 100% Post-Consumer Recycled Polyester; Stuff Sack: 100% Polyester
  • Shape
    Mummy, Ergonomic design with fitted hood
  • Odor Control
    HeiQ Fresh
  • Construction
    Stretch-knit, integrated armholes, snap connectors at shoulders, machine washable
  • Sustainability
    bluesign APPROVED, recycled fibres
  • Regular - Weight
    350 g (12.3 oz)
  • Regular - Dimensions
    193 x 80 cm (76 x 31 in)
  • Regular - Packed Size
    19 x 11.5 x 11.5 cm (7 x 5 x 5 in)
  • Regular - Recommended User Height
    185 cm (72.83 in)
Sizing Information
Professional Opinion
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