Insulating foldable box for transportation and packaging purposes

A kit of components for a rectangular-faced box, the kit comprising:

• first and second identical, thermally insulating, rectangular and rigid side face panels, each of the first and second side face panels having opposite top and bottom side faces and opposite end edges;
• first and second flexible belts respectively connecting between only portions of respective ones of the opposite end edges of the first and second side face panels for superimposing opposite faces of the side faces of the first and second side face panels when the belts are flexed and spacing the opposite faces of the side faces of the first and second side face panels a distance when the belts are unflexed;
• third and fourth identical, thermally insulating, rectangular and rigid side face panels that are always independent of the first and second panels and belts, each of the third and fourth side face panels having top and bottom edges and opposite end edges spaced by the distance for abutting between the opposite faces of the first and second side face panels at the end edges of the first and second side face panels when the belts are unflexed;
• and
• top and bottom, independent, thermally insulating panels respectively having rims for overlying and holding the top and bottom side faces and edges of the side face panels when so abutted, whereby to form a rectangular-faced box.