Proof prides itself on creating the most sustainable and eco-friendly sunglasses on the market, offering eyewear handcrafted from sustainable wood, cotton-based acetate, and recycled aluminum. Each frame is handcrafted and 100% one-of-a-kind. Frames come standard with stainless steel spring-loaded hinges to allow a range of face shapes and sizes to get the perfect fit. Most of our sunwear lenses have 100% UVA/UVB protection, and all of our optical frames come with clear lenses that your eye doctor can easily switch out for your prescription. All of the natural materials used in the construction of the frames are treated to protect from the elements and natural wear and tear.