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The Sea to Summit Reactor Lightweight Liner increases your sleeping bag’s warmth with minimal added weight using advanced Thermolite® Pro fabric.
The Sea to Summit Reactor Lightweight Liner increases your sleeping bag’s warmth with minimal added weight using advanced Thermolite® Pro fabric.
Sea To Summit

Sea To Summit Reactor Lightweight Sleeping Bag Liner Regular in Pewter

$69.95
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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 Lightweight Sleeping Bag Liner Regular in Pewter

Season:FA26

Brand:Sea To Summit

Code:532-PEW

The Sea to Summit Reactor Lightweight Liner increases your sleeping bag’s warmth with minimal added weight.

Optimized for minimal weight and maximum warmth, the Reactor Lightweight enhances sleep system performance with advanced Thermolite® Pro fabric. This fabric uses infrared-absorbing ceramic pigments and hollow-core fibers to trap and reflect body heat, boosting warmth by up to 4°C | 7°F without adding bulk. Designed for versatility and comfort, the stretch-knit construction moves with you as you sleep, while integrated armholes provide complete freedom of movement for unrestricted rest. The liner fits easily inside any sleeping bag and snaps into compatible Sea to Summit bags for secure placement and effortless entry and exit.

Treated with HeiQ Fresh odor control, the liner is quick-drying and machine washable. It helps prolong your sleeping bag’s lifespan by reducing the need for frequent washing, keeping insulation loft and performance intact. It is ideal for backpacking, travel, hut stays, and warmer-weather adventures. The liner is crafted with certified recycled fibers and bluesign® APPROVED materials to minimize environmental impact.

Features:

  • Freedom to Move: Stretch-knit construction and armholes provide unrestricted comfort for any sleep position.
  • Lightweight Thermal Boost: Thermolite® Pro with FIR and hollow-core fibers adds up to 4°C | 7°F warmth.
  • Easy to Clean: Quick-drying and machine washable with HeiQ Fresh odor control treatment.
  • Compatible Design: Fits all sleeping bags and snaps into Sea to Summit bags for secure positioning.
  • Protects Your Sleeping Bag: Reduces washing frequency to maintain insulation loft and extend bag lifespan.
  • Technical Shape and Hood: Ergonomic design with a fitted hood delivers optimal warmth and comfort without extra weight or bulk.
  • Lower Impact Materials: Crafted with certified recycled fibers and bluesign® APPROVED materials to minimize environmental impact.
Technical Information
  • Added Warmth
    Up to 4°C (7°F)
  • Best Use
    Backpacking, cycle touring, paddle touring, winter camping
  • Materials
    100% post-consumer recycled polyester; Stuff sack: 100% polyester
  • Shape
    Mummy
  • Features
    Stretch-knit construction, articulated arm openings, quick-drying, machine washable, HeiQ Fresh odor control, Thermolite Pro, Thermolite EcoMade
  • Regular - Weight
    255 g (9.0 oz)
  • Regular - Dimensions
    193 x 80 cm (76 x 31 in)
  • Regular - Packed Size
    18 x 10 x 10 cm (7 x 4 x 4 in)
  • Regular - Recommended User Height
    185 cm (72.83 in)
Sizing Information
Professional Opinion
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