100% silk sleeping bag liner. Adds 10-12 degrees of breathable insulation. Use it alone in warmer weather or indoors. Side/top entrance for easy in and out. Waterproof stuff sack included. Pillow compartment included. Can be used with any sleeping bag. Ties included on each side for a snug fit. 5-oz. overall weight. What We Like About the Silk Sleep Sack: The Silk Sleep Sack can be used with any sleeping bag to add 10-12 degrees of warmth on chilly nights. You can also use it as a standalone sleeping sack on warm nights or when sleeping indoors. The 100% silk material is breathable providing luxurious comfort you won't normally get while roughing it. When you're on the go the sleep sack folds into its own attached waterproof stuff sack. This prolongs the life of your sleeping bag liner and makes it easy for storage and travel. It offers easy top and side entrances and includes ties on each side for a snug fit. Use the Silk Sleep Sack without a sleeping bag for nights in hotels and hostels. This liner is perfect for any trip. About The Travel Hammock Inc. The Travel Hammock Inc. now known as Grand Trunk offers products that add to the enjoyment of outdoor enthusiasts. Established in 2002 out of Skokie Ill. Grand Trunk's outdoor hammocks are perfect for camping hanging out at the beach or relaxing in the backyard. These colorful hammocks have been used all over the world and are built to withstand the toughest conditions. Made to be environmentally friendly Grand Trunk's hammocks can be accessorized with the Tree Sling to elevate them even in the most difficult terrain. For high-quality versatile hammocks count on Grand Trunk. The lightweight Silk Sleep Sack is a sleeping bag liner made of 100% silk to add warmth and comfort to any sleeping bag.