Ride your city bike safely with the Lazer CityZen KinetiCore Light Green M. This bike helmet has KinetiCore fall protection. That makes the chance of serious head injuries even smaller if you fall. You can also attach an LED light to the back of the helmet. This way, other traffic can see you better in the dark. The light isn't included. You'll sweat less thanks to the 4 ventilation holes in the helmet. The openings reduce air resistance and cool your head. Choose this helmet if your head circumference is between 55 and 59cm. You can use the dial to adjust the size exactly to your head.