Fiber Optic Fabric (Outer); Ordinary Fabric (Inner)Buckle closureHandwash only7 Glowing Colors + 5 Blinking Patterns: LED fiber optic cap glows in 7 colors (red, green, blue, gold, light blue, purple, white); 5 blinking patterns - Mono, Flash, Gradient, Smooth, Multi color. LED baseball caps are perfect for events/party.Szie: Glowing hats are unisex. It is suitable for men or women. With adjustable shoulder straps and buckle. It fits almost everyone and is easy to wear. No heat, no radiation, harmless to the body, durable.Rechargeable: Powered by USB rechargeable battery, charging time is 2 hours on a full charge.LED caps can be gently hand washed with water up to 50 degrees Celsius or with natural soap (scrubbing only, no rubbing), but the battery case must be removed or kept away from water before washing. Please remove the battery compartment and keep the cord plug away from water. This fabric cannot be washed in the washing machine. Dryers or irons are prohibited. (Only hang to dry).