... Add Thermolite Reactor Extreme Sleeping Bag Liner … Free shipping for many … It's an excellent cold weather option for those who need additional warmth. 4.4 out of 5 stars 845. This mummy shaped sleeping bad liner adds up to 15 degrees Fahrenheit to your sleeping bag … Length: 86 in. Sea to Summit Reactor Thermolite Sleeping Bag Liner: Amazon.ca: Sports & Outdoors ... Sea to Summit Thermolite Reactor CompactPlus Sleeping Bag Liner - Adds up 20°F 4.6 out of 5 stars … Prices as low as $52.19. The first liner of its kind, the Reactor Thermolite Mummy Liner from Sea to Summit incorporates Thermolite material from Dupont. … Shop more great Sea To Summit products today. Pack the 9oz Sea to Summit Reactor Thermolite Sleeping Bag Liner on trips where the weather could change drastically or for a night under the stars. 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