As a manufacturer of some of America's finest down pillows, you would expect that DeWoolfson's pillow protectors would be extraordinary. These zippered pillow protectors are made from a 300 thread count, white-on-white damask stripe cotton fabric. The fabric is densely woven from the finest yarns and calendered under heat and pressure. The result is a fabric that is not only exceptionally light in weight, but also downproof and naturally dust mite resistant. This fabric was specially chosen to not interfere with the natural feel of a down pillow. Generously oversized to allow for shrinkage with frequent hot water washings. Exclusively DeWoolfson.