Main material: polyester fiber, fabric is coral fleece Season: Autumn/Winter Size: 23-25cm Target: Women Package Contents: 5 colors in total. Please note: This product may have a petroleum-like odor due to the manufacturing process. This is normal, so please be sure to wash it before use. The soft, fluffy coral fleece fabric is excellent for warmth and flexibility, making it ideal for autumn and winter. It is also breathable and very comfortable to wear. Since it is polyester, it dries quickly even after washing. It's quite loose and not tight, making it perfect as a room sock. Elastic rubber is used at the opening, so it doesn't constrict the ankles. The heel part has a 3D design that fits the heel perfectly. The ankle part has a high-quality seam design that fits the ankle perfectly and doesn't rub the foot. 4218