Sheridan - Crafted in premium quality Egyptian cotton, Sheridan's 500TC twill pillowcases are the key to a luxurious night's sleep. Crisp and lightweight with long lasting softness, this is a pillowcase you can count on to deliver comfort for years to come. Sheridan sheets are some of the highest quality you will find anywhere in the world. Every product is made to last and tested an impressive 100 times, compared to the industry standard of only three washes.