Sea to Summit Reactor Sleeping Bag Liner, Extreme Standard (85 x 31.5).

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 fibers. 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 utilizes hollow-core Thermolite Pro fibers in a grid pattern, providing the warmest sleeping bag liner available, adding up to 32°F of warmth to your sleep system. This insulated sleeping bag liner adds warmth and personal hygiene to any sleeping bag. Thermolite Pro technology uses knitted hollow-core fibers and absorbent infrared ceramic pigments to reflect body heat back to the wearer, improving warmth and comfort. 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 odor-resistant technology keeps the liner fresh even after extended use. This mummy-style liner features incredible stretch in the knit fabric for freedom of movement. It seamlessly adapts to any sleeping bag shape. Sea to Summit