The Expander Sleeping Bag Liner is crafted from super soft and stretchy poly-cotton, providing exceptional comfort and warmth. Perfect for travel, car camping, and various outdoor adventures, this liner keeps your sleeping bag clean while adding an extra layer of coziness. Its built-in antimicrobial treatment effectively prevents odors and remains intact even after multiple washes. Designed for convenience and luxury, the Expander Sleeping Bag Liner ensures a restful night's sleep wherever you go.