WARNING: YOUR TERPENES EVAPORATE QUICKLY. Without a terpene shield in your container or package, cannabis flower loses its terpenes and everything with it, the desired aromas, flavors and effectiveness you love! Boveda's Terpene Shield technology regulates the humidity of its environment. The 2-way moisture control technology allows for excess moisture to be absorbed or released as needed creating a terpene shield around your bud! DON’T CLOSE THE LID WITHOUT THE ORIGINAL TERPENE SHIELD™. Only Boveda offers a monolayer of purified water that protects your cannabis terpenes from evaporation and degradation. And as a company with 23 years devoted to the science of 2-way humidity control, we know you’ll benefit from our commitment to precision.