To use these sunglasses, simply put them on your face. They're great for wearing at parties or when you need to cut down on glare outside. When you're not using them, keep them in the provided case to avoid scratches. Clean the lenses with a soft cloth and some lens cleaner. Don't use rough materials or harsh chemicals as they can damage the lenses. Also, don't leave them in hot places like a closed - car dashboard for a long time as it might affect the polarization.