Bringing the laid-back spirit of Californian biking culture to your everyday, Thousand’s vintage-inspired bike helmet features a plethora of ingenious in-built features. Take note of the magnetic closure that avoids pesky pinches, a discreetly integrated visor, vegan leather straps to keep you sweat-free and a range of vents and cooling channels to keep you cool. Combining safety with a sense of easy elegance, Thousand helmets make a must-have addition to your biking equipment collection. 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. Each helmet features a secret poplock passage behind the brand logo for your anti-theft device.