This vapor barrier bag liner is a good choice for increasing the temperature rating of any bag (down or synthetic). By preventing evaportive heatloss the Reflex Liner will keep your bag's insulation dry which is especially important for multi-day outings. The Reflex bag liner is constructed from a metalized silicone coated nylon which helps block radiant heat loss as well as evaporative heatloss. The Reflex features a 36" #3 YKK coil zipper for easy entry/exit and improved venting. If temperatures are cold, cinch the one hand elastic cord closure at the top to keep the heat. If you're feeling too warm simply release the cord to allow excess heat/humidity to escape out the opening.
The coated/metalized fabric helps helps to block both radiant and evaporative heat loss. One size - 6'6" tall, 32" wide at shoulders, 22" wide at base. Weight. 5.52ounces/156grams.