WRITES THROUGH: The permanent ink writes through water, grease, and mud without clumping or smearing. This compact, all weather pokka pen survives splashes, stains, and smudges. | PRESSURIZED CARTRIDGE: All-Weather cartridge is pressurized, writes in temperatures from -30F to 250F, under water (up to 35 ft), and any angle. | POKKA PEN: The durable cap and barrel will survive toolboxes, backpacks, or anywhere you might stash this pen. The reversible cap extends the pen to a standard length for comfortable writing. | PROPRIETARY INK: The ink and delivery system used exclusively in Rite in the Rain Refills will write without skipping in extremely wet conditions far better than other comparable all-weather pens. | RITE IN THE RAIN NOTEBOOKS: The most ideal pen for Rite in the Rain weatherproof notebooks.