NORTECH Labs medium-extreme medical pouches are great for transporting products requiring temperature control. Their cold chain system ensures that your valuable temperature-sensitive payloads arrive in optimum condition. These pouches are constructed of a multi-layered metalized film composite exterior that reflects 97% of radiant heat. They are great for prescription medications, samples, food products, chocolates, seafood and other products requiring temperature control. Seam Type: Weld; Opening: Open-Side; Envelopes/Mailers Closure: Zip; Exterior Material(s): Metalized Film.