The Kombat Tactical F.A.S.T helmet-replica. The F.A.S.T. helmet replica (Future Armour Shell Technology) has primarily been relaunched from the original military helmet as an airsoft tactical/safety helmet...and safety,especially head protection,is absolutely paramount.While lightweight, the internal high density foam makes it a solid piece while the padded and removable soft foam inserts act as a cushioning for head bangs and also for the purpose of size adjustment. While we're on adjustment, there is a strap surrounding the the base of the skull and a dial that if turned, will adjust to the right size,offering maximum comfort and stability when used in conjunction with the chinstrap.The side rails can be used for attaching various bit of equipment such as night lights and the front mount for things like night vision goggles or filming equipment. The velcro ID panels mean you attach tactical patches and really pimp your lid! But be reminded to play carefully kids!