UV 400 indicates an eye protection item that has been optimized to prevent eye exposure to both UVA and UVB radiation. Eyes are exposed to sunlight could be at risk for serious damage to their eyes, which can lead to a number of issues including cancers of the eye, vision loss, cataracts, and blindness.
Safety Planet provides different lens types with UV protection: UV 400 Cycling Glasses, UV 400 Glasses for Outdoor Sports, UV 400 Ski/Snowboard Goggles.

Removing eyewear to wipe away fog can expose your eyes to potentially dangerous hazards and debris in your workplace. Anti-fog technology help people see clearly.
Fog Free can be applied to plastic, polycarbonate and other eyeglass lenses, including high-index lenses and Transitions photochromic lenses. Your lenses and vision stay clear when you make the transition from a cold environment to a warm one. It may also keep your lenses from fogging up during sports and other times you are hot and perspiring.

Lenses that are treated front and back with a clear, scratch-resistant coating have a much smoother surface that is more resistant to scratching.
The coating does not interfere with how the lens functions and does not affect vision. Though an anti-scratch coating is not 100% scratch-proof, but it helps to prevent minor scratches that can easily happen to a regular lens. These minor scratches can damage the surface of the lens and impair vision. An anti-scratch coating acts as a protective layer thus making the lenses more durable and safe.

Our sunglasses use vents drilled into the frames or the lenses themselves at precise positions, where air is prone to stream past without creating turbulence that can make it hard to see. Glasses without these holes for ventilation can create warm air pockets behind the lenses, which compound the problems of sweat around your eyes.
Proper ventilation allows the lens and air temperatures to equalize quickly. When the lens returns to air temperature fogging disappears. Our innovative exhaust vents to lenses and frames to facilitate better airflow.

It works by making the surface of the sunglass lens unattractive to the water molecules. The hydrophobic coating also weakens the surface tension (or bond) between the water droplet and the surface of the lens. This means the water droplet is more likely to roll off the surface of the lens.

Hydrophobic coated surfaces are also anti-static. This means that dust and other dirt particles are less likely to be attracted to them, if this does happen it is likely to just fall off. It resists stains and repels grease from fingerprints, so cleaning your lenses is quicker and easier.

Polycarbonate is the material favored by most sports eyewear manufacturers because it's very light and shatterproof, which is an impressive impact resistant lens. Being flexible is what enables it to absorb energy without fracturing. Polycarbonate lenses are more impact-resistant than plastic or glass lenses. PC lens provide a very high degree of eye protection.