They can be washed by placing some water in them, shaking them, and then wiping them clean. Thermal bags are not electrically charged; all cooling and heating energy comes from the food itself. Their principle is to prolong the shelf life.
Also known as passive refrigerators, thermal bags offer high insulation and constant temperature properties, effectively keeping food cool, warm, and fresh. Made of high-quality materials, they're easy to carry and are perfect for road trips, holiday outings, and family picnics. The inner layer is made of pearl cotton coated with aluminum foil for reflective insulation, providing excellent thermal insulation.