What is this flap ?



I well know these covers, that are really common and I also know this flap that's present on all current helmet cover. But what are these flaps used for ?
Someone told me it serves for NVG, other guys tell it serves for mask/google elastic,...
If someone have a concrete idea of the use of this flap, it interess me !
Thanks for response.
P-E



I well know these covers, that are really common and I also know this flap that's present on all current helmet cover. But what are these flaps used for ?
Someone told me it serves for NVG, other guys tell it serves for mask/google elastic,...
If someone have a concrete idea of the use of this flap, it interess me !
Thanks for response.
P-E





