Rite In The Rain All Weather Pens are designed to function in extreme conditions. Housed in a powder-coated brass barrel, the pressurised ink cartridge performs in temperatures ranging from -34°C to 121°C, under water up to 10.5 metres, and at any angle. Rite in the Rain's proprietary ink and delivery system will write without skipping in extremely wet conditions, allowing you to write through water, sweat, grease and mud without clumping or smearing.