The THERMOLITE® Reactor Fleece liner is Sea to Summit’s warmest sleeping bag liner. The regular Reactor Fleece Liner featuring a drawcord for adjustment and versatility is made from Thermolite® fabric and grid fleece for optimal heat retention. With the same features as our Reactor Liner, the fleece addition offers added warmth for maximum thermal boost.

Features

Traps insulating air to increase warmth of a 1 season sleeping by up to 22% and 10% for a 3 season bag
Sustainable construction- 60% Thermolite® All-Season fabric, which is made with 100% textile waste and GRS Certified, and 40% polyester yarn
Treated with Heiq Fresh FFL biocide-free effective odour control
Technical mummy-shape with drawstring hood.
Available in 2 sizes- regular and compact
Easy care – machine wash with no special soap needed. Avoid fabric softeners and dryer sheets.
Ideal for use as a sleeping bag in warmer weather or sandy environments.
Packs into its own Ultra-Sil stuff sack

BONUS: Easy to wash and helps to keep your down bag cleaner for longer

How to Choose

The Reactor Fleece is Perfect For...

Backpackers looking to add warmth to their sleeping bag for winter camping
Warm-weather campers who don’t need a full sleeping bag
Paddlers or desert users who want an easy-care summer sleeping bag they can easily wash the sand out of
Backpackers looking to extend the performance of a (perhaps older) sleeping bag for winter camping

Other Liner Options

The Reactor Extreme Liner is a slightly more compact, slightly lower-priced alternative for more moderate temperatures.
Performance-oriented, weight-focused end users may opt to use a one of our ultralight quilts

Cold Weather Liners