The invention provides an adjustable insulator for use with a can or bottle of drink, including a substantially planar body having a first end and a second end. The adjustable insulator includes adjustment means associated with the substantially planar body, including a first adjustment means part, associated with the first end of the substantially planar body, and a second adjustment means part, associated with the second end of the substantially planar body. The first and second parts together can adjustably connect so the first adjustment means part and second adjustment means part reciprocally connect in an adjustable manner for use about the can or bottle. The invention also relates to variants thereon and a method of use.

A method of producing a container product comprises providing a mold including a first part and a second part. The mold is closed to define a cavity having a first area and a second area. A molten plastic composition including a polymer and a physical blowing agent is filled into the cavity. Then, the molten plastic composition in the cavity is cooled, such that the molten plastic composition in the first area is completely cooled and solidifies or a central portion of the first area has micro uncooled molten plastic composition. The second area has the plastic composition in the molten state. The first part of the mold is moved in the axial direction. The molten plastic composition in the second area forms a beehive foam after foaming and expansion. Then, the foamed container product in the mold is cooled to take shape and then removed after opening the mold.