Sea to Summit - 100% Silk Sleeping Bag Liner - Standard The Sea to Summit Silk Sleeping Bag Liner is designed to add warmth and protect the interior of a sleeping bag from dirt and body oils. Constructed from high-quality ripstop silk, this liner features a mummy shape with a box foot and a drawstring hood. The material is lightweight, breathable, and provides natural temperature regulation. It packs down into its own integrated storage pouch, making it suitable for travel, camping, or use as a standalone liner in warm climates.