Skip to content
Reactor Liner (adds up to 14°F)
$69.95 $52.46

Reactor Liner (adds up to 14°F)

$69.95 $52.46
Our lightest thermal liner+ View tech specs
  • Shape
  • ColorBlack

BEST USE: Backpacking & Camping

WEIGHT: 8.7 oz | 248 g

LENGTH: 6 ft 10 in | 208 cm

PACKED SIZE: 5.75 x 4 in | 15 x 11 cm

Shipping & Returns

Our warehouse is actively shipping orders from 8am to 1pm MST Monday through Friday. Most orders ship in one business day, but the transit time can take up to 7 days, depending on your distance from Boulder, Colorado.

2nd Day and Next Day Air orders will ship same day if placed by 1pm MST, Monday-Friday (except holidays).

All orders are eligible for fast and easy returns within 60 days of purchase.

For more details, please check out our Help Center

Find Locally
Reactor Thermolite Sleeping Bag Liner _ packaged
Reactor Liner (adds up to 14°F)
$69.95 $52.46
Description || Reactor Liner (adds up to 14°F)


The THERMOLITE® Reactor liner is our top selling and lightest thermal sleeping bag liner. It's an excellent cold weather option for those who need additional warmth. The hollow core fibers trap heat and offer extraordinary insulating properties. This is a super stretchy, soft, and comfortable choice with a mummy shape, foot box and a drawcord hood. Compact and lighter weight than fleece, this is a best seller for good reason.

Design Details

Technical Features


Tech specs

  • Added Warmth
    Up to 14°F / 8°C
  • Best Use
    Backpacking, Camping
  • Comes With
    Ultra-Sil stuff sack
  • Material(s)
    Thermolite polyester fabric
  • Shape

Frequently Asked questions

Does this sleeping bag liner fit regular and wide sleeping bags?

This liner is made with durable stretch fabric so it can fit in any sleeping bag shape and you won't even notice.

Does the sleeping bag liner have a zipper?

No. In order to keep this sleeping bag liner at a minimal weight and packed size we did not include a zipper.

Is the sleeping bag liner machine-washable?

Yes! This sleeping bag liner is machine-washable for ease and convenience. You can wash your liner with laundry detergent and machine dry, using cool or low heat. Steer clear of fabric softeners, though, since they tend to reduce wicking performance of the fabric. 

Accessibility Icon This icon serves as a link to download the eSSENTIAL Accessibility assistive technology app for individuals with physical disabilities. It is featured as part of our commitment to diversity and inclusion.