The Thermic Expedition Sleeping Bag Liner is designed to warm Rab's expedition line of sleeping bags, but it's compatible with most other mummy bags. The liner's heavyweight microfleece is incredibly warm and soft without sacrificing the durability you expect from Rab's products. Microfleece sleeping bag liner provides more warmth for expeditionsMummy shape offers plenty of room for adjustments and warmthIncluded stuff sack is easy to store and pack so you can bring it anywhereMaterial100% syntheticShapemummyClaimed Weight18ozManufacturer Warrantylifetime