ACCORDING TO THE RUDY PROJECT WEBSITE: " ImpactX lenses are made by photochromic particles which provide unique climatic management technology. Getting dark from low to high light transmission within few seconds and tailored to reach a custom color from an initial clear state, ImpactX® lenses are available in 3 different colors and with the Laser mirrored coating ( Black and Laser Black , Red and Laser Red, Laser Brown). ImpactX® lenses enhance contrast , even in darker conditions, they will improve visual acuity and depth perception while providing unparalleled eye protection. Unlike most photochromic standard lenses, ImpactX® lenses are fused in the mass of the polymer itself with a complex manufacturing process, making it more resistant and clearly optically superior to most competitors."
What is incredible about these is that the lens can be with ZERO POWER, or WITH POWER (YOUR RX), it is, according to Rudy Project, virtually unbreakable, and it adjusts for various lighting conditions.... this is an intelligent and essential gear for serious outdoor athletes, such as triathletes, cyclists, mountain bikers and more.
Check it out at Sport & Sun, which has the largest selection of Rudy Project in the I.E.