Pencils work great on "Rite in the Rain". For those times when you need a pen, use the All-Weather Pen. The ideal ball point pen for use outdoors, with its pressurized ink cartridge and rubber-cement like ink. Writes underwater and upside down, and it will write in all weather conditions, even temperatures as low as - 50 F, fine point & has black ink Refillable with any of the refill cartridges (37, 47, 57). This pen folds to half its original size!