Unlike your shirttail or a scratchy paper towel, the E-Cloth Glasses Cloth helps you focus on the task at hand without distracting smudges — and removes over 99% of bacteria you'd rather not come face-to-face with. Dry or dampened with water, this super soft microfibre cloth gently removes dirt, fingerprints, smudges, and more from lenses and frames without scratching, with just a quick pass or two. How? Masses of precision-engineered microfibres break up and remove grime without adding chemical cleaners. Keep one in your glasses case. It's guaranteed for 3 years or 300 washes, saving stacks of tissues and paper towels.