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Sometimes you need just a little bit of extra warmth to your sleeping bag or maybe you have a a summer bag but want to maybe venture out later in the year once or twice and toss and turn in the cold every night. Sea to Summit has been there and knows how to fix your issue and that's with the Thermolite Reactor Sleeping Bag Liner. SLip this bad boy into your sleeping bag and you'll gain up to 14 degrees (F) of warmth to a sleeping bad or can simply be used alone for those blazing hot summer campouts. This doesn't mean you can take your summer back to the Alaskan Tundra, but it sure is nifty!Features: