Single Helmet Cable Lock (Cbl65)

Place a measuring tape just above your eyebrows, directly above your ears. It should be wrapped around the widest part of the forehead. While measuring your head, the measuring taps should sit snug to your skin, and you should not feel any extra pressure. Measure it as shown in the picture With the helmet strapped securely, it should not slip when you move the head from side to side or up and down.