6" x 6.5" Ecofoil Thermal Bubble Mailers - Pkg 250EcoFoil Thermal Bubble Mailers offer a lightweight, insulated solution for shipping temperature sensitive or fragile items. Ideal for pharmaceutical products, small perishable foods such as chocolates or cheeses, and other delicate goods, these mailers help protect contents from outside heat, contamination, and tampering. The poly bubble radiant barrier reflects 96% of radiant heat and emits only 4%, helping maintain internal temperature throughout