Using these Tifosi Stash sunglasses is easy. Just put them on like regular sunglasses. The adjustable ear pieces can be adjusted to fit your head comfortably. When you're cycling or doing other intense sports, they'll stay on well thanks to the rubber grips. As for care, use a soft, clean cloth to wipe the lenses. Don't use rough materials as they can scratch the lenses. When you're not using the sunglasses, store them in the provided protective case to prevent damage. Also, avoid leaving them in hot places like a closed car for a long time as it might affect the frame and lenses.