The Sea to Summit Silk-Cotton Blend Travel and Sleeping Bag Liner is a lightweight and compact silk-cotton blend sleeping bag liner for backpacking, camping, and travel. Made from a luxurious blend of 30 percent silk and 70 percent cotton, it’s the perfect blend of comfort and performance for active sleepers. The liner increases the thermal performance (by adding a few degrees of warmth), and extends the life of sleeping bags. It can also be used alone as hygienic bedding when traveling in hotels and hostels. The Sea to Summit Silk-Cotton Blend Travel and Sleeping Bag Liner is available in four styles: Mummy (measures 82 x 36 inches, packs down to 5 x 3.5 x 2 inches, weighs 5.2 ounces); Rectangular (measures 73 x 36 inches, packs down to 5.5 x 3.5 x 2.5 inches, weighs 5 ounces); Rectangular-Long (measures 82 x 36 inches, packs down to 5 x 4 x 2.5 inches, weighs 5.5 ounces), Traveller w/Pillow Slip (measures 85 x 36 inches, packs down to 5 x 4 x 2.5 inches, weighs 6.3 ounces; pillow not included). Storage case included. Machine washable and colorfast. Sea to Summit products are guaranteed against defects in materials or workmanship for the lifetime of the product.