Bubble wrap is a trademark of Sealed Air Corporation and is used primarily for packaging. It is made out of polyethylene with air bubble size options up to ½ inch.
The air bubbles provide effective conductive/convective thermal resistance but no IR thermal resistance. Hence, you need to put foil on either side of the bubble for it to be an effective insulator. These foil covered bubble wrap products have different trade names but their characteristics are all similar. At an average temp of 70F, the inherent 1” thermal resistance value of these types of products is about 5.5 R value, 6.1 clo, or 9.8 tog.
Thermal resistance values are additive. For example, ¼” thick foil covered bubble wrap would provide ¼ of the 1” thermal resistance values.