When this year’s rare “all-American” total solar eclipse comes around on August 21, you’ll want to be prepared. Whether you’re chasing the eclipse to Kentucky or viewing it from your backyard, you’ll need a way to watch it safely. That means an eclipse filter over your telescope, or specially designed eclipse glasses.

For the latter, you can just show up at your nearest Warby Parker, and their eye experts will hand over a pair of eclipse glasses. The stores are giving out the free eye protectors throughout August. The company’s Nashville store is also having an eclipse party to view the celestial event on the day-of.

Get your glasses early, because you don’t want to miss out on this eclipse, which will cross the continental U.S. from Oregon to South Carolina. There are only so many total solar eclipses you’ll get to see in your lifetime, after all.