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The Boulder Crest is constructed with a durable, polyester ripstop shell with a soft, polyester liner and is filled with synthetic TechLoft Silver insulation. TechLoft Silver insulation consists of multiple denier staple-length fibers that have a siliconized finish for maximum insulation, loft, and compactness. The Boulder Crest uses two-layer off-set construction featuring a contoured hood and mummy shape, which help seal in your warmth. For added heat retention, the Boulder Crest boasts an insulated chest and zipper baffle keeping the warmth in and the cold night air out.