US Patent 7290545 Face mask with anti-fog folding

A face mask is provided that is configured to reduce or eliminate fogging that may occur on eye wear or an eyeshield worn by a user of the face mask. The face mask includes a body portion that has a layer with an inner surface configured for facing the face of the user. The layer has at least one fold that extends in a horizontal direction across at least a portion of the layer. The fold has a fold forming portion located between and attached to two primary portions of the layer. The inner surface of the fold forming portion is in facing relationship with the inner surface of the vertically disposed lower primary portion.