Keep smudges off your optics by keeping a Vortex® Fog Free Field Kit in your bag. This is sure to become a checklist item when packing your field bag. First use the soft retractable bristles of the Ultra Brush to safely remove dirt and dust particles. Then apply the anti-fogging cleaning solution that won't affect the optical properties of the lens. Finish getting rid of dirt and fingerprints with the included microfiber cloth and your glass will maintain that "just-out-of-the-box" sparkle.