All our ski goggles come with two different interchangeable magnetic lenses, which is standard. We have tried to ensure you re covered with all weather conditions so the first lens option comes with a cylindrical and the second with a spherical design. You can change the lenses in seconds and choose the perfect one depending on the weather and light conditions for your game.That s not all, you also get a free prescription insert with your ski goggles. You can either choose to go with a prescription or the non prescription option, we include the prescription insert anyway so that gives you the freedom to reglaze it in the future if needed.