"Boost your comfort when sleeping outdoors and keep the inside of your sleeping bag more clean with a Mummy Sleeping Bag Liner from Alps Mountaineering. A shield from dirt, wood debris, and other material sticking to your after a day of adventure, liners also double as a light cover in warm weather. Easy-to-clean design is easy to remove from your sleeping bag and throw in a washer. Choose from the moisture-wicking, microfiber-like feel of a brushed polyester liner or the durable, moisture-absorbing, sheet-like feel of a polyester/cotton liner. Charcoal liner: polyester/cotton. Gray liner: Brushed polyester. 86""L x 32""W. Weight: 11 oz. Lightweight and comfortable liner for mummy sleeping bag Helps keep inside of your sleeping bag clean Doubles as a light cover in warm weather Available in brushed polyester or polyester/cotton"