The Rothco Interchangeable Optical System converts from goggles with an elastic strap to sunglasses with bayonet temples. The lens have UV400 protection and are anti fog and anti scratch. To switch from goggles to glasses simply replace the elastic straps with the bayonet temples. This CA Proposition 65 Warning is to provide notice that this product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Rothco Item No: 10388