lenses are a combination of impact resistant lens material with Microscopic Photochromic properties. This means that 720 Raygenic X™ lenses can adjust to the changing of lighting conditions automatically. Activated by the amount of UV rays, the lenses adjust and block just the right percentage of UV rays so that you are protected everywhere you go.
Each 720 Raygenic X™ lens can darken  within a few seconds and return to their original color in few minutes, which means you don't have to fuss with changing your eyewear to suit your conditions, because it's already done for you! The 720 Raygenic X™ is ideal for bike riders and joggers or anyone else that is out and about in all weather conditions.
With the new generation of 720 Raygenic XTM photochromic lens, powered by NXT®, athletes and sports enthusiasts can be benefited much by its outstanding features:
Extreme Protection: 
720 Raygenic XTM photochromic lenses are casted by NXT® high-tech material and manufacture. It is life-time guaranteed unbreakable, passing the regulations of FDA 21 CFR801.410 and ANSI Z87.1.
Joyful Comfort:
720 Raygenic XTM is made of the latest high-tech optical material, Trivex®, which makes 720’s Raygenic XTM photochromic lens 128% lighter than normal glass, 16% than CR-39 and 10% than polycarbonate. With this feather-like lens, combined with light TR90 frame, you can have more fun in and be devoted to your favorite sports.
Best Vision:
Based on 720’s SFTTM (Sport Focus Technology), NXT®’s light management technology enhances the optical quality of Raygenic XTM photochromic lens as well as makes it without vision and color distortion. The tint changes quickly with the light and UV: the stronger the light and UV, the darker the lens tint. The smart Raygenic XTM photochromic lens, powered by NXT®, protects your eyes from the annoying strong sunlight beams.
Now you can find the Raygenic XTM products on the Hitman (Asian-Fit) and Rider. That is very ideal for the cyclist who enjoys riding in the evening.
| Raygenic XTM (Day-Night Lens) |
Lightest |
<-------------------------> |
Darkest |
| Tint |
Light Amber |
 |
Dark Grey |
| Transmittance |
77% |
18% |
| Category |
Cat. 1 |
Cat. 2 |
(Source: Click here)
Though photochromic lens is good, 720 still strongly recommends that it is better to have a second pair sunglasses (with Cat.3) to give you thorough eye protection.
NXT® is the trademark of Intercast Europe, Italy.
Trivex® is the trademark of PPG Industries, USA.
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