The Dead Down Wind Evolve ScentPrevent Field Spray contains Nanozyme technology, DDW's newest enzyme technology, that prevents and terminates a broader spectrum of odor molecules including human, smoke, gas, and other synthetic contaminant odors. It is the last line of defense against any alarming contaminant scent a hunter may acquire before and during the hunt. The sprayer is an inverted technology that will allow you to hold the bottle upside down and spray out the product until the bottle is empty. For best results, use the full ScentPrevent system of laundry, body and field products. Shake well before using.