Features: 1.This heated cap contains flaxseed, which can effectively retain heat after heating and promote healthy hair growth. 2.Gentle warms your head and scalp, effectively nourish and care your hair, make your hair smoother and shiny. 3.Made of soft fiber cotton and nylon, light and durable, comfortable to wear, and it can be compatible with most head circumferences. 4.Lightweight and portable shape, wireless use design, convenient for you to use in daily work or leisure time without affecting your actions. Specifications: Material: Linseed + Microfiber Cotton Color: black Size: 30*22*3cm Weight: 557g Packing size: 25.5*18.5*5cm Size: The inner diameter of the elastic ring is 12cm (with elasticity, suitable for most sizes of head circumference), and the outer diameter is 25cm