The AirPress Pen is the perfect writing instrument for any situation. With worldwide patented technology and a rubber grip that is perfect for gloves, or even wet hands, the AirPress is always ready for writing everywhere - whether you need to write on something vertical, upside down or even underwater. World wide patented technology, Rubber grip, Writes upside down, vertical and underwater. Our favorite pen for keeping in your car! Withstands heat and cold.