Reactor Extreme - Thermolite Mummy Liner

€80.00 Sale Save

The THERMOLITE® Reactor Extreme liner is Sea to Summit’s warmest knitted sleeping bag liner. If your adventures take you to colder climates, the Reactor Extreme will add plenty of warmth to a sleeping bag. Plus in warmer weather, it can be used as a ‘stand-alone’ sleeping bag. 


  • The hollow core fibres of the THERMOLITE® fabric work like a polar bear's fur and, along with the knitted structure, trap plenty of insulating air
  • Super soft and amazingly stretchy
  • The Reactor Extreme uses a heavier version of THERMOLITE® to provide extra warmth for an incredibly comfortable night’s sleep
  • Added warmth: Up to 25°F / 15°C
  • Technical mummy-shape with drawstring hood
  • Keeps sleeping bag clean
  • Packs into its own Ultra-Sil stuff sack
  • Dimensions: 208 x 90 cm
  • Packed Size: 17 x 11.5 cm
  • Weight: 399 g
  • Materials: Thermolite polyester fabric
  • Easy care: machine wash with no special soap needed. Avoid fabric softeners and dryer sheets
  • How to choose - The Reactor Extreme is perfect for:
    • Backpackers whose sleep system will be used in colder climates
    • Campers whose sleeping bags don't keep them warm a the advertised temperature
    • Very warm-weather campers who don't need a full sleeping bag
    • Campers or backpackers looking to extend the performance of a (perhaps order) sleeping bag into shoulder seasons