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The Sea to Summit Reactor Thermolite Sleeping Bag Liner. Our best selling sleeping bag liner! The Reactor is made from 80 gram/m2 Thermolite the lightest weight Thermolite available. Thermolite is a hollow core fiber that provides extraordinary warmth for its weight and remains extremely breathable. Adds up to 14° F of warmth to a sleeping bag or, used alone, is the ideal warm weather bag.