Comfortable waistband Elastic legs Soft and breathable fabric textureCotton fabric makes you feel comfortable with its soft and breathable texture. Products designed for children's ergonomics allow freedom of movement. All day long, they are soft and comfortable, and they are flexible and free. There is 100 Cotton in this product. Cotton is a natural fiber Made of pure cellulose, cellulose is synthesized in nature. It's an organic substance created with low elasticity. It absorbs moisture well and keeps the heat cool by transferring it to the outside of the body. Care Instructions Wash at 30°C maximum. Do not tumble dry. Do not bleach.