An insulating sleeve combination for a frusto-conical beverage cup having an outer peripheral surface is disclosed, as well as a method of use thereof. The combination includes an opaque frusto-conical inner sleeve and a frusto-conical outer sleeve. At least a portion of the outer sleeve is transparent or translucent, such that indicia on the inner sleeve is visible or at least partially visible therethrough. The outer surface of the outer sleeve may includes a textured gripping surface, facilitating the manual grasping of the combination by the user. As such, a customized inner sleeve may be marked to indicate a favorite drink of the user, for example, with the markings being visible through the outer sleeve. The combination of the present invention is designed for repeated use, rendering prior art disposable sleeves unnecessary.