Micro Guard Pillowcase Performance: Micro Guard Size: 45 x 65 Composition: 75% Polyester, 25% Nylon Shrinkage Rate: Vertical 2%, Horizontal 3% Made in Japan Ultra-dense construction prevents dust mites from entering and does not release dust. Anti-mite effect is semi-permanent. When shipping, we will open the package for inspection, remove the cardboard inside, and fold it compactly for shipping. Thank you for your understanding. Please note that there may be wrinkles from packaging. Although unopened and unused, this is a fabric item that has been stored, so please refrain from purchasing if you are sensitive to such things.