It’s free Slurpee day at 7-Eleven stores everywhere. Starting at 11 a.m., the convenience chain will give away 7.11-ounce drinks until supplies run out or everyone’s brain hardens into an iced-over sugary boulder.

The Slurpee might be a staple of the 7-Eleven diet, but that doesn’t mean there’s not room for improvement. The convenience-store chain is introducing a line of of lower-calorie Slurpees in time for swimsuit season.