Tempur-Pedic Performance Air Pillowcases are built with exclusive Tempur micromesh fabric, which is 3 times more breathable than cotton for unmatched for cooling and comfort. The exclusive micromesh uses Tencel' brand fabric, which is luxuriously soft and silky. The Tempur Ultifit' construction conforms and stretches for an adaptable fit. Set includes 2 pillowcases. They are machine washable for easy care and continued use. Don't forget to pair these with the Tempur-Pedic Performance Air Sheet Set.