US Patent 10905187 Collapsible helmet

A collapsible helmet for use in various athletic activities, and which includes a structure that facilitates collapsing the helmet into a compact position for storage and/or transport of same. The helmet includes an outer shell having an inner cavity, and one or more flexible sheets, each of which includes a center portion and a plurality of segments. The sheets are positioned in the inner cavity such that they are movable and slideable relative to the outer shell and each other so as to allow the helmet to be collapsed from an open position to a collapsed position.