Bike helmet in navy blue color, vintage spirit of the Californian bikers of the 50s and 60s. Details : - Magnetic closure buckle to avoid pinching. - Integrated discreet visor. - Vegan leather straps to stay comfortable and sweat-free. - Adjustment wheel for optimal fit. - 7 air vents and 3 cooling channels to keep cool. Thousand helmets are available in 3 sizes. To make sure you don't make a mistake, measure your head circumference with a tape measure. - Small : 54-57 cm - Medium : 57-59 cm - Large : 59-62 cm Thousand helmets combine safety with elegance, perfect to accompany you. They also allow you to attach your helmet to your bike and leave it safely. Indeed, there is a secret poplock passage behind the brand logo for your anti-theft device.