Lightweight and compact for warm or cold weather Indian silk adds warmth, but also breathes and wicks Built-in stuff sack and drawstring closure for easy storage Claimed Weight: [mummy regular] 3.6oz, [mummy long] 4.1oz, [rectangular regular] 4.4oz Manufacturer Warranty: lifetime Expand the versatility of your sleeping bag and help it last longer with the Western Mountaineering Tioga Silk Sleeping Bag Liner. The silk fabric is extremely lightweight and compact, making it an ideal choice for backpacking trips when you want to add a touch of warmth without weighing yourself down. Plus, silk is also absorbent and breathable, so you can also use the Tioga in warm weather to protect your bag from dirt and grime.