may be used alternatively for fixing the caps. The GS systems are provided in the sizes S (age of elementary school), L (youths, adults) and XL (big adults). They are equipped with velcro tape and push-buttons, such allowing quick and easy mounting.. The metal-free button-and-rubber-band KG system is necessary for adults only in MEG and MRI environments.
Chin belt and KG system are suited for all ages.