Special omni-fit helmet for guest flyers, also known as the VIP helmet.
It is a one-size-fits-all helmet, that can quickly be adjusted to match a visitor who is having a one-off flight experience.
The Mk15 is equipped with double visors, the outer tinted visor having a flat cut bottom edge, handles on either side of the visor pivots allow for visor position adjustment. The shell is quite large as it covers all head sizes, this unfortunately results in people resembling mushrooms when wearing one.