Kelty Light Year XP 20 Synthetic Sleeping Bag Fill: Polyester Fiber; Shell: 100% Nylon; Liner: 100% Polyester Imported Temp Rating : 20 / -7C (EN Tested) Insulation : Ecopet Soft Synthetic Weight 3lb 5oz Ground-level side seams prevent heat from escaping Differential cut to maximize loft and warmth