Viscose Derived from Bamboo & Skin Friendly - Our Pillowcases are Viscose Derived from Bamboo, OEKO-TEX Standard 100 certified, ensuring compliance with rigorous safety and environmental standards, perfect for those with sensitive skin Cool Touch & Keep Dry All Night: Made of bamboo-derived rayon, this temperature-regulating pillowcase set offers superior breathability and moisture-wicking compared to microfiber/polyester, maintaining a cool, dry feel overnight. Suitable for hot sleepers seeking comfort without overheating 400 Thread Count Twill Weave Offers Enhanced Softness and Smoothness: The silky texture of bamboo rayon pillowcases glide over your hair and face to create a beautiful sleep, minimizing tension and breakage during sleep High Quality Invisible Zipper: Our zipper is well-constructed and durable, allowing smooth opening and closing. Unlike some pillowcases that tend to slip off the pillow overnight, these zipped pillowcases remain securely in place Durable and low-maintenance: Machine wash in cold water with similar colors, avoid bleach, tumble dry on low heat, and use a cool iron if necessary. To minimize creasing, promptly remove the product from the dryer after drying Bamboo Viscose Zippered Pillow Cases Queen Size Set of 2, 400 Thread Count Cooling Pillow Protectors for Hot Sleepers, Luxurious Hotel Quality - Silky, Soft, Breathable (20x30 Inches, Sky Blue)