Check the listing for details. Double Reflective Bubble Insulation Sheet 16" x 25 Ft Thermal Heat Rolls. Condition: New. Listed at 95.63 USD. SizeYou will receive 1 roll of bubble reflective foil insulation, measuring 16 in x 25 Ft/40cm x 7.6Meter(W*L), 3mm thick, enough length can be used for a long time. Energy SavingReflective aluminum foil is composed of upper and lower aluminum foil and a single layer of polyethylene bubbles in the middle. The surface aluminum film can directly reflect rays and heat, and the bottom aluminum blocks residual heat. It has double-layer protection and a better heat insulation effect. It can be insulated cold air to create a hot winter and block heat to create cooler summers, thus saving your electricity bill.More Than 808.3ounces/237g Thermal InsulationDouble-layer bubble reflective film has a thermal insulation effect of more than 808.3ounces/237g, and a thermal conductivity of 0.032-0.036W/m.K.