The Sea to Summit Premium Silk Sleeping Bag Liner is an ultralight and compact silk sleeping bag liner for backpacking, camping, and travel. Made from luxurious, premium AA Grade, ripstop silk with comfort stretch panels along the side to accommodate different sleep positions. 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 Premium Silk Sleeping Bag Liner is available in six styles: Mummy w/Hood (measures 82 x 37 inches, packs down to 4.5 x 4 x 2.5 inches, weighs 4.8 ounces); Mummy w/o Hood (measures 73 x 37 inches, packs down to 4.5 x 4 x 2 inches, weighs 5.5 ounces); Rectangular (measures 73 x 37 inches, packs down to 4.5 x 4 x 3 inches, weighs 4.6 ounces); Rectangular-Long (measures 82 x 37 inches, packs down to 5 x 4 x 3 inches, weighs 5 ounces), Traveller w/Pillow Slip (measures 88 x 37 inches, packs down to 5 x 4 x 2.75 inches, weighs 6 ounces; pillow not included); Double (measures 73 x 71 inches, packs down to 5 x 4 x 3.5 inches, weighs 9 ounces). 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.