Pillow cases are protective coverings for pillows, designed to keep them clean and hygienic. They are typically made from various materials, such as cotton, polyester, or linen, and come in different sizes to fit standard, queen, or king pillows. Pillow cases can also feature various designs and colors, allowing for personalization in bedroom decor. In addition to their aesthetic appeal, pillow cases serve practical purposes. They help to absorb sweat and oils from the skin, which can prolong the life of the pillow. Many people choose to wash their pillow cases regularly to maintain cleanliness and reduce allergens, contributing to better sleep quality.