Bobster Eyewear Decoder 2 Photochromic Sunglasses Photochromic sunglasses fuse technology with convenience and comfort. Designed specifically for constantly changing light environments, the polycarbonate lenses darken in the sun and lighten indoors. Within 1-2 minutes a smooth transition allows the eyes to adjust comfortably and naturally. Has both style and function with its light changing lenses. 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. Features: 100 UV protection Includes goggle strap, removable closed-cell foam, microfiber pouch and carry case