Clear is transparent providing 100 % light transmission. Light Gray is a very subtle tint that's DOT approved, it helps conceal scratches & an excellent choice for all conditions. Dark Gray looks similar to dark sunglasses, it's designed to be looked over & an ideal choice for a sleek sporty look. Light Green is a very subtle tint that's DOT approved and similar to a light aqua green. Opaque Black is the same as black glass (non-transparent & zero visibility) it must be clearly looked over at all times. DOT or Dept of Transportation approved tints are safe to use in any light or weather condition & also provides UV protection