Beverage container insulator assemblies and insulator sleeves

A beverage container insulator assembly, comprising:

• a beverage insulator having a beverage insulator wall, a beverage insulator interior formed by the beverage insulator wall, a beverage insulator neck in the beverage insulator wall and a neck shoulder on the beverage insulator neck;
• a retaining collar carried by the beverage insulator, the retaining collar having a collar wall, a collar flange extending from the collar wall and a collar opening in the collar flange;
• a beverage container in the beverage insulator interior of the beverage insulator, the beverage container extending through the collar opening of the retaining collar;
• and
• an insulator sleeve including:
• a sleeve base encircling the beverage container and retained between the neck shoulder on the beverage insulator and the collar wall and the collar flange on the retaining collar, the collar wall and the collar flange of the retaining collar retaining the sleeve base against the neck shoulder on the beverage insulator neck with the retaining collar retaining the beverage container in the beverage insulator and the insulator sleeve on the beverage container;
• a thermally-insulating, flexible, expandable and contractible insulator sleeve body extending from the sleeve base through the collar opening of the retaining collar, the insulator sleeve body engaging and substantially conforming to the beverage container;
• and
• an expandable sleeve neck on the insulator sleeve body, the sleeve neck engaging the beverage container.

An insulator sleeve for a beverage container, comprising:

• a sleeve base having an insulator sleeve base ring;
• a sleeve neck having an expandable insulator sleeve neck ring;
• a thermally-insulating, flexible and expandable insulator sleeve body including:
• an insulator sleeve body base portion carried by the insulator sleeve base ring of the sleeve base;
• an insulator sleeve body wall portion extending from the insulator sleeve body base portion, the insulator sleeve body base portion looped around the insulator sleeve base ring of the sleeve base and attached to the insulator sleeve body wall portion;
• and
• an insulator sleeve body neck portion at the sleeve neck, the insulator sleeve neck ring carried by the insulator sleeve body neck portion.