Sea to Summit Reactor Sleeping Bag Liner
Best lightweight thermal layer for backpackers seeking extra warmth and comfort.
This liner effectively boosts thermal performance in cool conditions using advanced infra-red absorbing fibers. Its stretch-knit construction ensures a comfortable fit, while the integrated footbox opening offers versatile ventilation and mobility for campers on the move.
$66.46
at
Klarna
Who it's for
- Cold sleepers needing extra warmth without a heavier sleeping bag
- Active campers who prioritize a dry and hygienic sleeping environment
- Ultralight backpackers and travelers with limited pack space
Who should skip it
- Restless sleepers who prefer more legroom and freedom of movement
- Rugged users who are hard on their outdoor equipment
- Summer campers looking for a substantial standalone sleeping solution
Performance breakdown
Thermal efficiency
Infra-red ceramic pigments provide a noticeable boost to sleep system warmth.
Packability
Compresses down to a negligible size, easily fitting into any pack.
Mobility and ventilation
The clever footbox opening offers welcome relief during warmer, restless nights.
Material comfort
Stretch-knit fabric feels soft against the skin without restricting natural movement.
Weight-to-warmth ratio
Adds significant insulation while barely registering on a backcountry scale.
System versatility
Seamlessly integrates with almost any mummy bag to extend seasonal utility.
Thermal efficiency
Infra-red ceramic pigments provide a noticeable boost to sleeping bag warmth.
Packability
Compresses down to a negligible size for minimal pack footprint.
Material comfort
Stretch-knit fabric feels soft against the skin and moves with you.
Ventilation versatility
The footbox opening offers quick temperature regulation without leaving the bag.
Weight-to-warmth ratio
Adds significant insulation without weighing down your ultralight kit.
Fit adaptability
Drawcord closure ensures a snug fit across various mummy bag shapes.
Key Specs
Material
Thermolite Pro, EcoMade polyester
Shape
Mummy
Stuff Sack
Included
Stuff Size
5.9 x 2.8 x 4.3 inches
Dimensions
Compact 78 x 31.5 inches, Standard 85 x 31.5 inches
Weight
Compact 9.5 ounces, Standard 10 ounces
Intended Use
Weekend camping, backpacking
Warranty
Lifetime
Know before you buy
Still have a question?
Ask Metto anything about the Sea to Summit Reactor Sleeping Bag Liner before you decide.
