The Decoder 2 has both style and function with its light changing lenses and ability to convert from a sunglass to a goggle.The temples easily release with our R.I.S. technology and quickly become a goggle with the included strap. The other unique feature is the closed cell foam, when attached the Decoder 2 is a full frame sunglass but quickly remove it and it becomes a half frame sunglass.The anti-fog lenses lighten or darken in changing lighting conditions (85-22%). So many variations all in one eyewear!