This refined aviator style features classic design constructed from monel metal and nickel silver with SuperThin Glass lenses. The Castles bring a style that look great as both men's and women's aviator sunglasses  and are a great choice for consumers demanding a durable, comfortable, high-performing frame. Details Lens Material: SuperThin Glass - Provides the absolute crispest optics available. 20% to 32% thinner and lighter than standard glass, it offers the best scratch and solvent resistance. Rx Power Range: +3.00 to -4.50 Face Size: Extra Large