Helmet weight: 660g, helmet size: 30*19cm adjustable carrier and chin/neck pads ensure the best fit. Removable and adjustable inner pad. Convenient and easy to wear. The head circumference is suitable for approximately 56-61 cm (22-24 inches). The environmental protection material is frosted to resist scratches and wear, and the frosted texture is more textured. The built-in EVA cushion is shock-resistant and decompresses without burden. The net weight of the mask:280 grams. Adjustable elastic headband. Comes with a fan system to prevent fogging of the lens and enhance the use effect. The mask is designed with multiple openings, which has good air permeability and is comfortable to wear. Use as a full face mask or use separately from non-fog glasses. Equipped with 2 different lenses, which can better adapt to different environments. 100% Customer Satisfaction Guarantee: If you have any questions, please do not hesitate to contact us and we will immediately correct the situation or provide a refund/exchange.