US Patent 11877668 Neck pillow

A neck pillow comprising a cylindrical body that can encircle a neck of a human body, wherein the neck pillow is wearable around and detachable from the neck, wherein the cylindrical body has hardness for stably supporting the neck of the wearer and is provided with a fastener that is openable and closable on a front side of a wearer, and wherein degree of opening of the fastener can be adjusted by a millimeter unit from an upper edge of the cylindrical body in accordance with a height of the lower jaw of the wearer.