An insulator apparatus (10) for a beverage container having a section of foam material (12) with a generally rectangular configuration, a first self-coiling spring strip (14) affixed adjacent to a top of the section of foam material, and a second self-coiling spring strip (16) affixed adjacent to a bottom edge of the section of foam material. The first strip is in generally parallel relationship to the second strip. The first and second strips operate so as to self-roll the section of foam material around an exterior surface of the beverage container (40). Each of the first and second strips have concave side and a convex side and the property that, when straightened, the strip holds a straightened shape and, when bent in a predetermined direction, the strip self-rolls to encircle the beverage container. The first and second strips are of identical configurations.