So what is the 365 sleeping bag you ask? It's just the best sleeping bag you'll ever own, that's all. The 4-layer design allows you to use it all year long! From warm summer nights camping with the family, to ridiculously cold winter hunts while being snow trapped in a wall tent, this bag is built to keep you warm and comfortable. Our high performance 300D poly/canvas material is the only option with this bag. This fabric is abrasion resistant, mold & mildew resistant, and has a PU coating for optimum wind and water resistance, while also providing maximum breathability. Right side zippers are the most common, but left side zippers are an option. Layering provides comfort temp range from +35 to -20 Durable 300D polyester canvas shell Soft and comfortable cotton flannel liner High-loft HolloFiber insulation Rugged #8 zipper with lifetime warranty 40" x 90" finished size Weighs 19 lbs Roll-up hood with organizer pockets sewn in