The blended combination of Chick-fil-A's cold brew coffee and vanilla soft serve was first introduced nationally in March as a limited-time menu item but, apparently, never wore out its welcome (i.e. it sold well).
Keeping Frosted Coffee makes sense as it offers an alternative to Starbucks' Frappuccino as well as McDonald's and Burger King's Frappes.
Photo via Chick-fil-A.