SBDs? Cut The Cheese? Breaking Wind? The Solution is Subtle Butt. Each 3.25 inch (8.5 cm) square filter is made of soft fabric-covered antimicrobial activated carbon and has a vast surface area for bad odors to adhere to and get neutralized. Two adhesive strips are strategically placed so you know which side attaches to the underwear. And at around 1/16 inch thick, you will never know it's there but you will be able to tell that it is working by what you don't smell. 3.25 x 3.25 x 1/16 inch