Sea to Summits premium blend Silk + Cotton travel liner/sheets combine two natural fibers for sleeping comfort and traveling performance. This fiber combination is perfect for sensitive skin and feels similar to a high thread count cotton sheet. Double folded and reinforced seams enhance the durability of this sleeping system. Use this alone as sleeping sheets in warm weather, in hostels or hotels. Add it to your sleeping bag as a thermal liner or protective sheets from sweat and body oils. Packs up very small for easy carrying in the provided zippered pouch. Machine washable & colorfast. 4 sizes available: Standard (73"x36"), Traveller with Pillow case (88x36"), Mummy with Hood (82"x36"), Long (82"x36").