Shimano Aerolite Spare Lens Description: The Shimano Aerolite Spare Lens is designed for aggressive on and off-road cycling where light conditions constantly change. The photochromic lens stays light grey in low-light situations and turns dark grey in full sun, maintaining natural colors in sunny and cloudy weather. Features: Replacement Lens for Shimano Aerolite half frame sunglasses Photochromic lens changes tint to block out bright sun or clear up in overcast conditions VLT: 17-85% Specifications: Model: Aerolite Color: Grey