The GoGirl™ Combo includes both the GoGirl™ and the GoGirl™ Extension so you can be prepared for any situation. The GoGirl™ Extension is a 6” long tube made from medical grade silicone that attaches to the GoGirl™. The GoGirl™ Extension provides extra clearance so you can pee further away from yourself or allows you to go into a container or bottle. We recommend using the GoGirl™ Extension when wearing bulky clothing or extra layers such as, hunting gear or snow pants.