Sometimes when you are on the go you do not have space to carry back ups of everything you need in your pack. Those are the times it helps to have a pair of backup replacement lenses for your sunglasses. Grey and rainy in Seattle when you leave the house, yet when you get up on Stevens Pass the sun is shining, no problem. It might be a beautiful day in Steamboat Springs in the morning, yet soon enough the snow is flying and you need a lens that will brighten your sight of the slopes. When you purchase Oakley products you know you will have a superior level of service to go along with your high quality sunglasses.