Each pair is made from recycled sabers we tactically acquired from the Polish Calvary's archives. That's a lie, but the SABER's durable frame and lens is probably better at protecting your eyes than actual sabers. INCLUDES 3 SETS OF EASY-TO-CHANGE LENSES The technology used in our Interchangeable lenses is exactly the same as that used in our regular fixed lenses. The difference is that each frame comes with three sets of easy-to-change lenses, in different shades and colours. This allows you to choose one frame that fits you best without being concerned with whether or not you chose the right lens colour for your activities. A zipper case is included, so you can pack your extra lenses when you head out on longer adventures. ONE FRAME INCLUDES 3 SETS OF LENSES: grey lens for bright light conditions brown lens to increase contrast and depth perception in medium to bright light conditions orange lens depending on the model to protect against elements in medium to low light conditions