Smart Bike Helmets for Adults - Front and Rear LED Lights - ROCKBROS

【Helmet Size】:This bicycle helmet is designed for adults; suggested age range: adults with large head size; suggested head circumference: 61-64cm(24 to 25.2 inches).To determine the correct helmet size,please wrap a measuring tape around youe head,the tape should rest 1.5cm bove your ears and remain level around the circumference of your head 【USB Rechargeable Front and Rear Light】: Our cycling helmets is designed with USB rechargeable front and back light .While the front lights provide lighting, the rear lights provide higher visibility for the vehicles or people behind you, providing better protection on the city streets at night.The rear lights have 4 modes: constant, flash, slow flash, warning flash.You don’t need to remove the helmet to change the light 【Adjustable Bicycle Helmet】:Our road bike helmet for men and women with Dual Fit adjustable design,size adjustable dial at the back of the helmet and side straps helps to fit different head circumference.Turn the dial to adapt