Functions in extreme conditions. The pressurized ink cartridge writes upside down and through moisture without smearing or washing off. 

WRITES UPSIDE DOWN
Pressurized ink cartridge performs in temperatures from -30F to 250F, under water (up to 35 ft), and at any angle.

INK WON'T SKIP
Proprietary ink and delivery system used exclusively in Rite in the Rain Pens will write without skipping in extremely wet conditions.

WRITES THROUGH
Permanent ink writes through water, sweat, grease, and mud without clumping or smearing.