The materials and build feels solid. Never tried the bottle opener but it seems like it will work. The lens are very lightweight and clear. However the part that rests near my nose left some marks after just 30 minutes of wear. It's a bit difficult to clean dust and other contaminant off the lens. However overall, it's a lightweight and quality product

Another note: Be careful when ordering because when I ordered mine, it came very dirty with debris all over the case, lens, and body. Additionally the box had some oil marks on it which took awhile to remove. The glass itself wasn't in any packaging. They definitely sold me a used box that someone probably returned. I was going to file a complaint and have the glasses exchanged, however I needed the sunglasses at the time so I just cleaned up everything and brought the sunglasses back to looking near new. However for the money, I expected a new product like they advertised you know?