the coffee pack is constructed using twolayers a white metallized highbarrier natureflex&trade outer layer from innovia films.laminated to a biopolymer sealant inner layer. it&rsquos a combo that provides high seal strength and structural integrity.this innovative ecofriendly integrated packaging system using natureflex&trade includes an aroma protecting bio valve, designed and patented by goglio plastic division.natureflex&trade films are certified to meet the american astm d6400 and european en13432 standards for compostable packaging.