HELMET

A helmet comprising: an outer shell; a head mount, configured to be mounted on the top of the head of a wearer of the helmet; wherein the head mount is suspended within the outer shell such that, in use, an air gap is provided between the head mount and the outer shell; the head mount comprises a plurality of straps, that are configured to extend across the top of the head of a wearer of the helmet, and a head ring that at least partially surrounds the head of a wearer of the helmet, extending around the craniocaudal axis; and the helmet further comprises: a head engagement device that is provided on a surface of the head mount, that is configured to face the head of a wearer of the helmet, such that the head engagement device can move relative to the head mount; and a head engagement device support that is configured to inhibit the movement of the head engagement device through gaps between the straps and/or head ring of the head mount into the air gap between the head mount and the outer shell.