Problems with smelly gas? Gastrointestinal discomfort? Smelly spouse? Subtle Butt disposable gas neutralizers use activated carbon to eliminate bad odors and save you from the smell (or the embarassment). These 5 saving graces (also affectionately known as fart pads or fart filters) effectively filter the odor caused by flatulence. Simply stick one to the inside of your underwear and you're ready for even the biggest chili cook-off.