To use these 100% S2 sunglasses, simply put them on like you would any other pair. They're great for all kinds of sports. When you're out in the rain or sweating, the Hydroilo coating helps keep the lenses clear. Remember to avoid scratching the lenses. If they get dirty, use a soft cloth to gently wipe them. You can switch the nose piece if the default one doesn't fit well. Keep the spare clear lens in a safe place for when you need it, like in low - light conditions. Store the sunglasses in a protective case when not in use to prevent damage.