Using your Pit Viper Blue Ribbon Flight Optics is easy. Just put them on like any regular pair of sunglasses. The spring hinge arms will adjust to your head size for a comfortable fit. These sunglasses are great for flying or any outdoor activities, offering 100% UV protection. When it comes to cleaning, use the included Limpcloth™ to gently wipe the lenses. Avoid using harsh chemicals or abrasive materials as they can scratch the 2.2mm polycarbonate lenses. After use, store them in the Firmcase™ to protect them from damage. The no - slip grip ear and nose pieces ensure they stay in place, but be careful not to bend them too much to maintain their function. Enjoy clear vision and style with these awesome sunglasses!