The Redwood is a “heavy-duty” oversized rectangle bag. The Redwood series use 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 TechLoft insulation will keep you warm and toasty on those colder nights when you’d prefer to have more “wiggle room” than you get with your mummy bag. It uses 2-layer offset construction to eliminate cold spots. For transporting, we include 3 webbing straps with quick-release buckles that keep your “rolled-up bag” secure. Oversized rectangle Two-layer construction Rugged cotton canvas outer 100% cotton flannel liner Heavy-duty, #10 zipper Roll-up strapsTemperature Rating-25Dimensions38″ x 80″FillTechLoft SilverOuter MaterialRugged CanvasLiner100% CottonLiner ColorFlannelTotal Weight13 lbs.ShapeOversized Rectangle