Our Bounced silk pillowcases are made with a special measure called momme weight, which is different than thread count. Our pillowcases have a momme weight of 22, which is perfect for silk because it provides a great balance of softness and durability. Since silk fibers are naturally strong, a higher momme weight means your pillowcase will last longer and won't wear out as easily, while still feeling super soft and luxurious. So you can sleep on your Bounced pillowcase and enjoy all the benefits of silk for a long time to come!