Polynum Ultra: Pure aluminum foil laminated with two layers of double polyethylene Big bubbles (8mm each layer, Fire Retardant) and internal reflection layer. The 16mm multi-foil/bubbles structure is laminated with two reflective aluminum layers (95% to 97% reflectivity) for maximum radiant heat reflection (low radiant heat absorption) with a tested Emissivity of 0.03 to 0.05. Our high resistance anti-corrosion treatment is applied to all Polynum products for durable performance under all climate conditions including coastal areas, high humidity, livestock buildings. Optional: 18 microns aluminum with bi-directional reinforced netting for extra strength. Polynum ULTRA Advantages: ***** HighThermal resistance (R-value 3.72) ***** Lightweight- therefore easy to apply * High performance * Moisture-proof, fungus, and mold-free ***** Does not attract nesting, rodents, birds, or pests* * Does not collect dust, does not retain bacteria, odors nor dirt. ***** Friendly User & Safe: No protective equipment such as gloves or breathing equipment is required for installation ****Hypoallergenic, non-crumbling material, no airborne microparticles, does not create respiratory problems. **** Cost Effective