Hope you enjoy shopping and have a great day!If you have any questions about the product, please feel free to contact us.We will answer and solve your problem within 24 hours.Motorcycle helmets are waiting for fearless rider adventures. what are you waiting for?Features of Bluetooth Flip Helmet Full Helmet:★Bluetooth headset can listen to music, answer calls★The host is waterproof, rainy weather does not affect the use★ABS helmet body, EPS high-density buffer layer★Removable inner lining, soft and comfortable, cool and breathable★Efficient ventilation performance to ensure head comfort★Double lens design, block sunlight, wind and dustName: Motorcycle bluetooth helmet double lens flip helmetHead circumference size:M: (57-58cm/22.4-22.8 in) L: (59-60cm/23.2-23.6 in)XL: (61-62cm/24-24.4 in) XXL:( 63-64cm/24.8-25.2in)Shell material: ABSApplicable season: all seasonsApplicable gender: unisexCertification: DOT/ECE safety certificationBluetooth parameters:Lithium battery: 1200 mAPackage includes:1X Bluetooth motorcycle full helmetThe size of this product is manually measured, there will be some errors, please refer to the actual productDue to different computer monitors, light and different shooting angles, there may be slight chromatic aberration