Product Name: Pillowcase Size: Free Size - Length 45cm, Width 83cm (Stretches both vertically and horizontally) Color: Gray Material: Bear Tenjiku Composition: 83% Cotton, 12% Synthetic Fiber (Carbon-infused fiber), 5% Polyurethane Made in Japan This is a pillowcase woven with carbon yarn. The main feature is the material that stretches vertically and horizontally. This allows it to fit almost all pillow sizes. Drastic temperature changes can lead to poor health, and in particular, feeling cold can be the root of many illnesses. Please experience the natural warmth that carbon provides. The material uses domestically produced (knitted at a Wakayama factory) Bear Tenjiku fabric. It fits the pillow well and is a material that doesn't easily wrinkle, making it a recommended material! The smooth fabric, neither too thick nor too thin, provides a comfortable feel that enhances your sleep. Here are 5 main recommended points from sumisen! 1: The yarn itself is carbonized. 2: Absorbent, quick-drying, and provides a cooling sensation - comfortable to wear and gentle on the skin! 3: Specifications that make the most of the fabric's characteristics. 4: Excellent antibacterial properties. It's fine to wash it many times. 5: The deodorizing power of carbon.