The Rite in the Rain All-Weather Clicker Pen Black features a pressurized ink cartridge that operates effectively in temperatures between -30°F and 250°F, underwater up to 35 feet, and from any angle. Its exclusive proprietary ink and delivery system ensure smooth, skip-free writing even in the most challenging wet conditions. The permanent ink resists water, sweat, grease, and mud, delivering clear, smudge-free marks without clumping.