The lenses of uvex g.gl 300 take off polavision goggles can be easily changed. Thanks to its interchangeable magnetic lens construction, changing lenses is no longer difficult and annoying. You simply click the preffered lens on or off the mini magnets. The polavision lens protects your eyes from glaring sunlight and disturbing reflexions. This model is also suitable for prescription eyeglass wearers. supravision technology by uvex ensures clear sight - the goggles do not mist up. uvex g.gl 300 take off polavision is a state-of-the art product for superior wearing comfort through technology by uvex - made in Germany.