Abstract: A collapsible helmet including a left arched member and a right arched member, each of the left and right arched members has a front portion and a rear portion, the front portions of the left and right arched members being hingedly attached at a front attachment point and the rear portions of the left and right arched members being hingedly attached at a rear attachment point, thereby forming a substantially elliptic headcover surrounding the left and the right head hemispheres of a wearer when the helmet being deployed in its operative position, and a middle arched member, the middle arched member has a front portion and a rear portion, the front portion of the middle arched member being hingedly attached at the front attachment point to the left and right arched members, the rear portion of the middle arched member being hingedly attached at the rear attachment point to the left and right arched members, the middle arched member extending longitudinally across the crown of a wearer when the helmet being dep

Abstract: A collapsible helmet including an elliptic headband and an arc-shaped strap hingedly attached to the headband, the strap extending laterally across the crown of a wearer when deployed in its upright operative position so as to define a head protecting shell and lying co-planar with the headband when deployed in its folded inoperative position so as to define a relatively thin compact package. The helmet further includes a pair of arc-shaped ribs hingedly attached to the headband, the pair of ribs extending longitudinally across the crown of a wearer when deployed in their upright operative positions and lying co-planar with the headband when deployed in their folded inoperative positions. The helmet still further includes a face guard hingedly attached to the headband, the face guard extending laterally across the chin of a wearer when deployed in its downward inclined operative position and lying co-planar with the headband when deployed in its folded inoperative position.