展开Bike helmet in duck blue color, vintage spirit of the Californian bikers of the 50s and 60s. Details: - Magnetic closure buckle to avoid pinching; - Discreet integrated visor; - Vegan leather straps to stay comfortable and sweat-free; - Adjustment wheel for optimal fit; - 7 vents and 3 cooling channels to stay 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.