The Blaze series sleeping bags are constructed with a durable, polyester ripstop shell with a soft, polyester liner and are 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 Blaze uses two-layer off-set construction featuring a contoured hood and mummy shape, which help seal in your warmth. For added heat retention, the Blaze boasts an insulated chest and zipper baffle keeping the warmth in and the cold night air out. The Blaze is offered in multiple sizes and temperatures to accommodate most people. The Blaze is a great bag to add to your camping essentials. 4591153 Blue/Charcoal Regular 4592141 Blue Coral/Charcoal XL