Final price reduction! New Prescription -3.5 Hele i Waho Snorkeling Mask Yellow Green My father bought this several years ago, but his prescription changed and he never used it, so it's been in storage. There's an oil film on the inside of the lenses from when it was purchased. I've polished it with anti-fog solution for the listing, but it's still new and unused. Please clean it again before use. The rubber shows no signs of deterioration. If the prescription is right for you, please consider it. I'm not familiar with diving, so I can't answer questions. I've taken photos of the instruction manual for your reference. Due to the shipping cost, I can't accept significant price reductions, so please understand. The case has some scratches from storage.