Review (3/5): Kind of awkward to use
These patches are made of silicone and are meant to block sun rays. They're fairly large for my wife's face (she's the one who got them), and they don't stay on quite as well as she'd like for outdoor activities such as running. In fact, she's used them in the winter months, when the weather where we live is mild to cold. In the summer when it gets hot, they're even less likely to stay in place. So, these may work for some people, but they didn't turn out for us to be quite as waterproof/sweatproof as the product description implies.