Shocks. Although all TAG Heuer eyewear are tested for impact you should still avoid violent shocks to your eyeglasses / sunglasses. Apart from damaging its appearance, this can cause premature wear in materials and components, which may affect your frame.
Chemical products. Contact with chemical products (solvents, detergents, cosmetics, etc.) may damage the external and internal parts of your eyeglasses / sunglasses.
Sand. Sand includes small minerals and can scratch your sunlenses.