We recommend always keeping your glasses or sunglasses in their protective case when you are not wearing them, to ensure they remain undamaged and scratch-free. Whilst our glasses are treated with a scratch-resistant coating, they are not scratch-proof, so please use caution and common sense when taking them on adventures! Our lenses should be cleaned with the included microfiber cloth or a lens-safe spray; don't use towels, t-shirts or other fabrics, as these are can be abrasive to the anti-reflective coating and may cause rubbing marks or scratches over time.Saltwater, sweat, sand and sun lotion can cause discoloring to the frames and lenses. Remember to clean the frames with a drop of lotion free dishwashing liquid in some lukewarm water from time to time.Always use a microfiber cloth when cleaning your sunglasses. If needed add a drop of lotion-free dishwashing liquid to some lukewarm water and use to clean the lenses. Rinse thoroughly with tap water.Some materials are corrosive and will damage your glasses if exposed to them; we advise you to keep your glasses away from these at all times. These include:chlorine-treated water or salt-water (don't wear them in the pool or the ocean!);aerosol sprays such as hair spray, paints and solvents.If any of these substances do touch your lenses, clean them with the microfibre lens cloth and a lens-safe spray as soon as possible. Extreme heat or cold may also cause lens or frame warping, so we recommend keeping your glasses with you, especially on very hot days, rather than leaving them in the car!