A face mask won’t keep you from getting enough oxygen, but it might keep you from seeing clearly through your glasses. When you exhale, your warm breath usually dissipates into the air in front of you. When you’re wearing a face mask, on the other hand, it gets funneled through the gaps around your nose and turns into tiny water droplets after colliding with your much colder lenses. In other words, it fogs up your glasses.

To prevent this from happening, Warby Parker has created an anti-fog spray that absorbs those droplets as soon as they form on your lenses, before they can cloud your view. It’s not the only product like it on the market—Amazon alone has dozens—but Warby Parker’s version has the added benefit of cleaning your lenses, too.

The perfect solution.Warby Parker

As Prevention.com reports, the spray is part of the company’s “Clean My Lenses Kit,” which comes with a bottle of anti-fog spray, a microfiber cloth, and a pouch for your glasses (or for storing the other two products in the kit). All you do is spritz both sides of your lenses, wipe them down with the cloth, and venture out for your fog-free day.

The spray works with any type of lens, which makes it a useful innovation even for people who just wear regular sunglasses. It can also come in handy during plenty of other fog-inducing situations, like sipping a hot beverage or cooking over a hot stove.

You can order a kit online for $15, or look for one in your local Warby Parker store. In the meantime, here are a few DIY ways to keep your glasses from getting foggy.

[h/t Prevention.com]