Switch Vision Sunglasses is the first company to offer magnetic interchangeable lenses that makes switching fast and easy. Switch Vision lenses will literally jump into place when brought close to the frame, and will stay in place once they snap into position. Switch Vision magnetic interchange lenses have been engineered to stay in the frame when subjected to the intense, repeated jarring of running, mountain biking, skiing, snowboarding, etc. Pricing is consistent throughout the Switch Vision line. Price is a function of whether the primary lens is polarized or not. Given the same lens options, every model is the same price.