A sleeping bag liner is your solution. This Sea to Summit Thermolite Reactor Extreme sleeping bag liner adds a full 25°F of warmth and extends the life of your sleeping bag. Browse Sea to Summit's top-rated sleeping bags and pads and more. Designed to mirror the warmth of down feathers, it comes in grades intended to keep wearers warm in various weather conditions. The THERMOLITE Reactor Compact sleeping bag liner is the ideal choice for gram counters under 6 feet. A sleeping bag liner does exactly what it sounds like - it lines your sleeping bag. Along with extending the life of your sleeping bag, the Sea to Summit Thermolite Reactor sleeping bag liner adds 14°F of warmth. The hollow core fibers trap heat and offer extraordinary insulating properties. It's an excellent cold weather option for those who need additional warmth. Thermolite is a type of synthetic insulation, trademarked by the Invista corporation.
Free shipping on many items ... Sea To Summit Thermolite Reactor Compact Plus Liner Camping travel. Available at REI, 100% Satisfaction Guaranteed. It can also be used as a stand-alone sleeping bag in warmer climates and has a quarter length zipper to control temperature and allows the user to get in and out of easily.

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It essentially uses a combination of two weights of THERMOLITE fabric, with the thicker more insulative being strategically placed across the torso and in the feet area.

This is a super stretchy, soft, and comfortable choice with a mummy shape, foot box and a drawcord hood. The Thermolite Reactor liner from Sea to Summit provides an ample amount of warmth while still being breathable. $17.79. They also help keep your bag cleaner for longer. I am skeptical of that, but a good Thermolite liner can certainly add 5-15°F to your bag’s rating. Thermolite® is a hollow core fibre that provides amazing warmth for its weight and remains extremely breathable.

Our bestselling sleeping bag liner! It is designed to be worn as a barrier between you and the actual sleeping bag itself. You can sleep in the liner wearing clothes or butt naked. 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 considerably. The Reactor is made from 80g/ m² Thermolite®—the lightest weight Thermolite® fabric available. The Reactor adds up to 8°C of warmth to a sleeping bag or can be used alone as a warm weather bag. Sleeping bag liners add warmth to your sleeping bag, act as a protective layer so you can wash your sleeping bag less and make your sleeping bag more comfortable. These liners are similar to the sheets used in your bed, in that they provide a level of protection and warmth.

Do you ever wonder how you can make your sleeping bag warmer? A good sleeping bag liner can improve the temperature rating of your summer sleeping bag – some manufacturers make very optimistic claims of up to 25°F. The liner is usually made of a thin cloth and is shaped like a cocoon.

Find the best Sea to Summit Reactor Extreme Thermolite Sleeping Bag Liner at L.L.Bean. Even though this sleeping bag liner is marketed towards those sleeping in cold conditions, I find it versatile enough to use in temperate climates as well.

Available at REI, 100% Satisfaction Guaranteed. Find the best sleeping bag/pad for your next outdoor adventure using our independent reviews and ratings. Our community of gear reviewers has field-tested and rated the top sleeping bag liners available.
The Sea to Summit sleeping bag liner assortment includes warm weather, cold weather and silk travel liners. NEW Acecamp Pongee Fabric Mummy Sleeping Bag Liner w/Stuff Sack - Add Warmth! The THERMOLITE® Reactor™ liner is our top seller in the sleeping bag liner range.