Foggy goggles are the most common gear complaint in the pool. You push off, take three strokes and the black line disappears. The good news: fog is fixable, and you almost never need new goggles to fix it. Your goggles aren't broken, it's just the anti-fog!
This guide covers why goggles fog, the habits that keep them clear, the quick fixes that get you through a session, and the long-term fix that keeps fog-free swim goggles going for months. Jump to the section you need, or read it through once and never squint at the pace clock again.
Why swim goggles fog up
Fog is condensation. Your face warms the air trapped inside your goggles, and the water outside cools the lens. When that warm, humid air hits the cold lens, it forms tiny droplets that scatter light. That's the grey haze you're looking through.
New goggles come with an anti-fog layer on the inside of the lens that stops those droplets forming. It works brilliantly at first, then slowly wears off with chlorine, salt water, wiping and storage. Once it's gone, the fog comes back every swim. If you want the detail on how long that takes, read how long anti-fog lasts on swim goggles.
Habits that stop goggles fogging
- Don't touch the inside of the lens. Fingers, towels and swim caps strip anti-fog fast. If something's on the lens, rinse it off.
- Rinse in fresh water after every swim. Chlorine and salt left to dry on the lens wear the anti-fog down.
- Dry and store them properly. Let them air dry, then keep them in a case, not squashed in a wet kitbag.
- Get the fit right. Leaky goggles let water in, the lens gets wet inside, and fog follows. Adjust the strap and nose bridge before blaming the anti-fog.
- Keep sunscreen and moisturiser off your hands. Whatever's on your fingers ends up on the lens.
- Splash your face before you put them on. A smaller temperature difference between your face and the water means less condensation.
Quick fixes that last one session
These all put a temporary film on the lens. They work, but they wash off, so you're redoing them every swim.
- Anti-fog spray or drops: the most reliable quick fix. See our guide to the best anti-fog spray for swim goggles.
- Baby shampoo: cheap and effective for a session, but it stings if you don't rinse it well. Here's whether baby shampoo for goggles is worth it.
- Spit: free, always with you, gone after a few laps.
- Toothpaste: often suggested, but it's mildly abrasive and can scratch lenses. Skip it.
Here's what goggle brands don't put on the box: Speedo, Arena, TYR and Zoggs all sell goggles with built-in anti-fog, and all four also sell anti-fog spray to fix them when that anti-fog wears off. If the factory anti-fog lasted, there'd be nothing to sell.
In our experience, sprays barely last one session and often sting. Many contain alcohol (TYR's lists water, isopropyl alcohol and detergent), so check the label before you put it next to your eyes.
The long-term fix: replace the anti-fog
Once the factory anti-fog has worn off, you can't re-coat goggles at home. You can replace it, though. FOG OFF! is a clear anti-fog patch that sticks inside each lens and keeps your goggles fog-free for 3+ months (based on 3+ swims a week). One size fits any swim goggle, and there's nothing to spray or rinse before each session.
- Remove any factory anti-fog from the inside of the lens with a little detergent and a microfibre cloth, then dry it completely.
- Peel the RED tab, position the patch with the BLACK tab (nose side first) and press firmly from the nose edge outward. Peel off the BLACK tab.
- Before each swim, dip your goggles in water and gently rub the film to activate it.
The full process is in our guide on how to restore anti-fog on swim goggles, and in our how to apply video.
Fixes for your goggle brand
- Speedo goggles fogging up
- Arena goggles fogging
- Zoggs goggles anti-fog
- TYR goggles anti-fog
- NanoClear goggles fogging up
Fog isn't a reason to buy new goggles
Broken strap, leaking seal or cracked lens? Time for a new pair. Fog isn't. If you're not sure which camp your goggles are in, read when to replace swim goggles. Every pair you keep is about 23g of plastic out of landfill.