TRIWONDER High Elasticity Sleeping Bag Liner Lightweight Camping Travel Sheet - Portable Sleeping Sack for Camping, Travel, Youth Hostels, Picnic, Planes, Trains 80% Polyester Fiber + 20% Elastic Fiber Imported FUNNY STRETCH -- The sleeping bag liner is made from Polyester & Elastic Fiber, all-round strong elasticity allows you to stretch randomly, feel free to switch varieties of sleeping pose. Great tensile and strong in ripstop OPTIMAL COMFORT -- Ice silk sleeping sheet is soft with a smooth feeling, no irritation to the skin, absorb sweat effectively to service you a refreshing night WATERPROOF -- Water drops on the travel sheet surface like lotus leaves, 100% waterproof sleeping sack. It can dry quickly, always keep you in dry and clean FUNCTIONAL -- The ultralight camping sheet can be folded compactly in the palm size storage bag, convenient to carry. And the liner is machine washable, a durable recyclable travel linen BREATHABLE -- High elastic sleep sack shows a strong ability in breathability, can freely match with sleeping bag, ideal for Camping, Picnic, Planes, Trains, Hostels, Backpacking, etc