Removable Inner Pads &Sun Visor: the Sun Visor comes with the adult bike helmet can be removed easily, securely to help keep sun out of your eyes and avoids rain into the eyes during cycling. Encased inner pads is for added comfort and easy to clean because of its detachably, which strengthens internal construction and makes sure your head all wrapped in safe and breathable condition. Adjustable & Snug Fit: Thanks to its Adjustable Dial System and Side Straps, the bike helmet can accommodate heads of various sizes for a custom fit and suits for most teens and adults. Suggested head circumference: 54-63CM (Please measure your head before purchase.). Crafted for Maximum Comfort: Featuring the special aerodynamic design, 18 vents make air ventilated, keeping your head cool and dry during high heat conditions. In addition, our bike helmet is ultra-light design, which ensures less pressure on your head even for a longer duration of wearing. Rechargeable LED Helmet Rear Light: Zacro CH01 Bicycle helmet with USB rechargeable rear light provides 3 lighting modes: constant light, slow flash, and fast flash. (can last no less than 8 hours), easy to operate by one press button. Each mode achieves enough visibility for people behind you to clearly recognize your direction, avoiding collision and much safer in night cycling. Excellent Safety Protection: CE-approved (European Standard) and CPSC-certified (American National Standards). Zacro bike helmet is well-constructed with integrated polycarbonate rugged PC shell and high density shock-absorbing EPS foam material, giving it excellent shock absorption and drop resistance ability, thus can reduce impact force effectively and provide you the most reliable safety.