To use these Tifosi Selca sunglasses, simply put them on like you would any other pair of sunglasses. They're great for outdoor activities like hiking, running, or just a casual day out. When not in use, keep them in a protective case to avoid scratches. Clean the lenses with a soft, microfiber cloth. Avoid using harsh chemicals as they can damage the lenses and frame. Also, don't leave them in hot places like a car on a sunny day as this can affect the materials. Enjoy your adventures with these stylish and functional sunglasses!