The THERMOLITE® Reactor™ Extreme is the warmest backpacking knit sleeping bag liner offered by Sea to Summit. The hollow fiber threads work just like the hollow fur of a polar bear in that they trap heat effectively. When the mercury drops you'll appreciate the mummy shape and drawcord hood with mini cord lock attached. Depending on your environment and sleep conditions, this liner can increase your sleeping bag warmth by up to 14C/25F.
Packed Size Comparison
Similar to a red cup that is solo.
14 oz ˜ Lighter than a roll of paper towels
Adds up to 25°F to the temperature range of your sleeping bag.
Easy to wash and helps to keep your down bag cleaner for longer.
- Adds up to 25°F / 14°C of warmth to a sleeping bag
- Lighter weight, more packable than fleece
- Mummy shape with a box foot
- Drawcord hood with mini cord lock
- Packs into its own Ultra-Sil™ stuff sack
|Regular Mummy||Long Mummy|
|Dimensions||82 in / 208 cm||92.5x35.4" / 235x90cm|
|Stuff Sack Size||6.5x4.5" / 17x11.5 cm||6.5x4.5" / 17x11.5 cm|
|Weight||14 oz / 399 g||14.9oz / 422g|
Sea to Summit THERMOLITE® Reactor Extreme Liner
When the mercury really drops, our THERMOLITE® Reactor™ Extreme sleeping bag liner will seriously extend the warmth, longevity and versatility of your sleeping bag