Sea to Summit Silk/Cotton Blend Travel Liner - Traveler with Pillow Inserts silk Ideal as hygienic travel sheets Improves thermal performance of sleeping bags Lightweight, super compact Friendly to sensitive skin Double folded and reinforced seams Machine washable & colorfast Mildly increases the thermal performance of sleeping bags Friendly to sensitive skin Double folded and reinforced seams Extends the life of sleeping bag Machine washable &amp; colorfast