The patented BedJet Cloud Sheet is a performance engineered, luxuriously soft, 100% cotton top sheet designed to work in tandem with your BedJet unit. It's sewn with a series of specially designed interior air flow chambers to help evenly diffuse the BedJet air down onto your body. When your BedJet is on, the Cloud Sheet becomes wonderfully puffy and soft, just like your favorite down comforter—but instead of heavy feathers, the Cloud Sheet is filled only with conditioned BedJet air, making it one of the softest, lightest, and coziest temperature control layers ever made! When your BedJet is off, the Cloud Sheet deflates to look just like a regular high-quality top sheet.