Writes Through: The Permanent Ink Writes Through Water, Grease, And Mud Without Clumping Or Smearing

Pressurized Cartridge: All-Weather Cartridge Is Manufactured In The Usa By Fisher Pen Company. The Pressurized Ink Writes In Temperatures From -30F To 250F, Under Water (Up To 35 Ft), And Any Angle

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 Weatherproof Pens

Ink Delivery: Tiny Pockets In The Pen'S Tip Will Deliver Ink In The Worst Conditions Without Allowing Water Or Air Back Into The Cartridge