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Fever Zero from Yeti is the world’s lightest sleeping bag. It weighs a mere 280 g (L) with a packsize of only 11x18 cm and equipped with an ultralight and special YKK zipper applied to support packability and function. Yeti’s record breaking Next to Nothing 2.0 Technology is an ultra lightweight, tearproof nylon fabric weighing only 20 g/m2. The fabric has a ripstop construction and is made from ultra fine 7 denier yarn. Only five weaving machines in the world can produce this exclusive fabric. The bag is filled with 100% pure white Crystal Down with a fill power of amazing 900+. All Yeti Crystal Down lives up to the Yeti Ethical Down Code.