The right lens matters more than the frame. Use this guide to match a lens to your light, your sport and your time of day.
Start with the light
Sunglass lenses are grouped into filter categories by how much visible light they let through (VLT, visible light transmission). The lower the VLT, the darker the lens.
| Category | Light let through (VLT) | Best for |
|---|---|---|
| Cat 0 | 80–100% | Clear lens: night, dusk, indoor, wind and debris protection |
| Cat 1 | 43–80% | Overcast days, forest trails, low light |
| Cat 2 | 18–43% | Mixed sun and cloud, changing light |
| Cat 3 | 8–18% | Bright sun: open roads, beaches, most summer riding and running |
| Cat 4 | 3–8% | Very bright conditions such as high mountains. Not suitable for driving. |
Lens types
Mirrored
A reflective outer coating that cuts glare and keeps your eyes cooler in strong sun. A good default for road cycling and running.
Polarized
Filters reflected glare from water, wet roads and car windows. Great for fishing, paddling and road riding. Some riders prefer non-polarized on trails because polarization can flatten the look of wet roots and rocks.
Photochromic
Darkens in sunlight and lightens in shade, so one lens covers more of the day. Ideal when you start before sunrise or ride in and out of trees.
Clear
Maximum light for night runs, early starts and indoor training. Still blocks wind, dust and bugs.
High-contrast tints
Amber, rose and brown tints boost contrast and depth, making ruts, roots and road texture easier to read in flat or mixed light.
Quick pick by sport
- Road cycling: mirrored Cat 3, or photochromic for long days with changing light.
- Mountain biking and trail: high-contrast Cat 1–2, or photochromic.
- Running: mirrored Cat 2–3 for daytime, clear for night.
- Fishing and water: polarized Cat 3.
- Hiking: polarized or mirrored Cat 3; Cat 4 only for high altitude and snow.
Questions?
Not sure which lens fits your ride? Email us at contact@sportglassgear.com and we'll help you choose.