Our pillow covers are designed for everyday use with 600 threads count per square inch,yet it gives a feel of hotel bedding.The pillow cases queen size are made of 100% natural and long-staple cotton for a comfortable and rejuvenating sleep.Our white pillow cases are made of cotton.The pillowcase set offers not only a soft hand feel,but it also provides comfortable breathability,reliable strength,and a neat and tidy appearance.It is softer and more breathable then Egyptian Cotton. High-Quality Material: Made from bamboo viscose with a 400 thread count for softness and breathability Effective Protection: Pore size of 3-4 microns prevents dust entry, keeping pillows clean and hygienic User-Friendly Design: Features a wider opening and durable zipper for easy removal and washing Standard Size: Fits 20" x 26" pillows, suitable for various pillow types Durable & Tear-Resistant: Strong, tear-resistant fabric ensures long-lasting use