When it comes to iced drinks at Starbucks, there’s no shortage of tasty options. Purists swear by cold brew, iced coffee and frosty Americanos, while maximalists are likely of the Frappuccino persuasion.

Starbucks cold foam fans are in for a frothy treat. The coffee chain is letting rewards members add cold foam to its cold drinks for free from Wednesday, May 7, through Sunday, May 11. And the brand’s Cold Foam Days celebration doesn’t end there. It’s also introducing a fresh flavor of the popular add-on.