For extended durability, we recommend that your frames be kept in safe environments. Do not store glasses in your pockets, backpacks or hanging from your pocket. When not in use, place them in a hard case. We also recommend that you re-apply coating to your frames if the wood becomes too dry or light. Regular application will help protect against cracks and significantly improve the look and durability of the wood. Recommended coating include: Beewax, Lip-balm, Walnut oil or Butcher block oil.