What is mk 4 helmet?

The Mk 4 helmet is a ballistic combat helmet used by the British Armed Forces. It is made of a lightweight composite material and is designed to protect the wearer's head from ballistic threats, impact, and fragmentation. The helmet features a four-point chinstrap system for a secure and comfortable fit, as well as a detachable night vision mount and communication equipment. The Mk 4 helmet has been used extensively in recent conflicts and is considered to be a highly effective piece of protective equipment for soldiers.