Stretch Knit Polyester Bed Bug & Dust Mite Control King Pillow Protector 100% Polyester Made in US Stretch Knit Bed Bug & Dust Mite Control king Pillow Protector 100-Percent polyester laminated to a urethane membrane with a satin like feel An effective barrier to bed bugs and dust mites and is also waterproof Sewn with at least 12 stitches per inch and a heavy gauge rust proof nylon zipper Lifetime warranty, made in the USA