Features: Breathable and Comfortable: This disco ball helmet has a good ventilation system, ensuring you won't feel stuffy while dancing. It's very comfortable to wear and won't put pressure on your head. It's perfect for party decorations and stage props, and can also be applied as a decoration for your home and office. Specifications: Material: glass, foam Color: silver Size: 11.81inch/30cm Package includes: 1 x Helmet Notes: Manual measurement, please allow slight errors on size. The color may exist a slight difference due to different screen displays. It cannot be used as a protective device for public transportation, for example, it cannot be used while riding a motorcycle