REVIAN Red Hair Growth System | My Cap Is Too Large / Too Small

My Cap is Too Large / Too Small
What should I do if the REVIAN cap feels loose on my head?
The REVIAN cap is designed to fit head sizes 54cm (21.25) to 64cm (25.2). This corresponds to fitted adult hat size of 6 3/4 to 8 (Small to XXL). The cap is designed for use with differently sized rear headliners, which are included in the cap's ...
Should REVIAN headliner adjustments be added to the front or back of the cap?
Any adjustment or headliner addition needs to be made to the back of the cap as described in the instructions that came with your device, as the cap's sensor is located in the front of the cap. The sensor must be touching your forehead/hairline in ...

REVIAN Red Hair Growth System | My Cap Is Too Large / Too Small | Knowledge Base