Modern helmets allow for exact adjusting the headband diameter with minimum efforts by using rotation mechanism (ratchet) or headband strap lock.
Smooth adjustment is carried out by means of a ratchet, whose turning adjusts the headband diameter to the desired size. Helmet headband adjustment can be also done by means of a headband strap lock.
- Open the lock. Hold down the lock with your thumb and forefinger so that the fixing strap moves freely in the lock.
- Uncover the headband. Move the fixing strap to the last notch so that the free end of the strap is left.
- Adjust to the head size. Put on the helmet and tighten the fixing strap to the head size.
- No adjustment is required next time .