Sleeping Bag Liners

Built with a blend of 70% Coolmax Ecomade (100% recycled) and 30% biobased Tencel Lyocell fibres the Breeze provides stretch comfort and excellent ...

The Tencel-polyester blend is soft and stretchy. It wicks moisture well for comfort on warmer, more humid nights

The THERMOLITE Reactor Compact sleeping bag liner is the ideal choice for gram counters under 6 feet who want to add warmth to their sleep system. ...

The THERMOLITE Reactor Extreme is the warmest backpacking knit sleeping bag liner Sea to Summit offers. The hollow fiber yarns work just like the h...

The soft and cozy Synergy Sleeping Bag Liner adds warmth, comfort and years of life to any sleeping bag. Contributing up to 5F/3C degrees of warmth...

The THERMOLITE Reactor liner is Sea to Summit's top seller in the sleeping bag liner range. It's an excellent cold weather option for those who nee...

Built with Thermolite® fabric and grid fleece, boost the performance of your cold-weather sleep system with the Reactor Fleece liner what was buil...

Powered by Thermolite® Pro fabric using an innovative infrared technology, the Reactor Liner provides exceptional warmth, versatility and the free...

Powered by Thermolite® Pro fabric using an innovative infrared technology, the Reactor Extreme Liner provides exceptional warmth in colder-weather...

The Expander sleeping bag liner is a super soft and stretchy poly-cotton making it wonderfully stretchy and warm. It's an ideal choice for travel, ...

The THERMOLITE Reactor Fleece sleeping bag liner is a luxuriously soft and super warm liner that can bump up the warmth of your sleeping bag consid...