1. The inner lining determines the size of the helmet: Please measure your head circumference before purchasing, and buy the size that suits your head circumference. If the helmet you purchased is not the right size, please email us and we will send you a larger or smaller liner. 2. If you need extra sun visors, please go to my store to buy the outer sun visors you like. Product standards: DOT, ECE standards, if you need DOT certification documents, please email us, we will send them to you by email. Features - Bluetooth Helmet ☞Lightweight design: suitable for long-distance motorcycles or urban commuters, reducing fatigue caused by nerve pressure, weighing only 2.8 pounds ☞Strong and highly elastic front sun visor ☞Streamlined aerodynamic design - reduces wind noise and drag ☞Removable and washable cheek pads, easy to clean ☞Ventilation System: The intake and exhaust are fully adjustable to create a constant and light airflow to help keep the rider cool and comfortable. ☞The helmet is equipped with a freely switchable sunshade inner lens, which can quickly respond to strong sunlight or instantaneous brightness changes in the tunnel. Product Type: Full Face Bluetooth Helmet/Modular Bluetooth Helmet Product weight: 2.8 lbsPacking list: Bluetooth helmet*1, HD anti-fog film*1 Service: If you have any questions before purchasing or after using, please email us, we will solve the problem for you within 10 hours after receiving the email!
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