*Transitions Signature 8- lenses will turn dark when you walk outside and will rapidly return to clear indoors.
*Transitions XtraActive - lenses will get darker outdoors and even activate behind your car windshield. Lenses will return to clear indoors, possibly with a slight tint.
*Polarized-are sun-glass lenses that block all UV rays from damaging your eyes. They also reduce glare, make images appear sharper/clearer, increasing visual clarity and comfort.