Sea to Summit Reactor Sleeping Bag Fleece Compact x Liner, (78 31.5).

Insulated sleeping bag liners bring warmth and personal hygiene to any sleeping bag. Hollow-core Thermolite Ecomade fibers are used in a grid-pattern fleece for maximum warmth. The drawcord footbox can be opened or closed for optimal comfort and integrates perfectly with the Sea to Summit sleeping bag's Free-Flow Zip System footbox. HeiQ Fresh anti-odor technology keeps your liner fresh even after extended use. Mummy shaped for maximum thermal efficiency, with shoulder zippers and a footbox drawcord for additional temperature regulation. The Sea to Summit Warranty covers the life of this product. The Sea to Summit Reactor Series insulated sleeping bag liner extends your comfort zone and improves sleeping bag hygiene. Thermolite hollow-core fibers are engineered to resemble polar bear fur, efficiently trapping heat and providing a luxuriously soft and comfortable feel. Stretch-knit fabric provides optimal comfort, allowing the Reactor to fit any sleeping bag. Additionally, a drawcord footbox provides ample ventilation and versatility for moving around camp while wearing the liner. Available in three different weights, the Reactor Technical Liner makes your existing sleeping bag warmer and more versatile. The Regular Liner uses hollow-core Thermolite Pro fabric with infrared-absorbing ceramic pigments and Thermolite Ecomade fiber. This lightweight fabric adds up to 14°F of warmth to your sleep system. The Extreme Liner features thicker hollow-core Thermolite Pro fabric, adding up to 25°F of warmth to your sleep system. The fleece liner uses hollow-core Thermolite Pro fiber in a grid pattern. This provides the warmest sleeping bag liner available, adding up to 32°F of warmth to your sleep system.