Dune Therapy GogglesEach set comes with three different lenses. Chrome(sunglass), Amber, and Clear. They are held in by magnets that have an inner seal to keep dust, sand and other debris out. The lens colors allow you adapt to any lighting scenario, and the magnetic design makes them very easy to change on the fly. They have two anti slip straps. One strap is smaller for use without a helmet, while the other is designed to work with a helmet, giving you the option