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The Yellowstone series sleeping bags are made with Techloft insulation. Techloft Insulation consists of multi-hole staple-length micro-denier fibers that have a siliconized finish for maximum insulation, loft, and compactness. The Yellowstone uses a 2-layer offset construction, sometimes called a "bag within a bag." The contoured hood and mummy shape helps seal up your warmth and keep you warmer. The Yellowstone is a great backpacking sleeping bag to take along on your hikes that won’t take up all the space in your pack. features at a glance • TechLoft Insulation • 2-layer Construction • Insulated Chest Baffle & Zipper Baffle • Contoured Hood • Compression Stuff Sack Included specs Outer Fabric: 210T Nylon Diamond Ripstop Outer Color: Green/Black Liner: 210T Polyester with Buckmark Logo Repeated Liner Color: Black Shape: Mummy Zipper: #8 Separating