ConvaTec SUR-FIT Natura - 4" Durahesive Cut to Fit Skin Barrier has a large size flange opening, making it ideal for people with bigger stomas. The Sur-Fit Natura system makes an audible clicking sound when the barrier is connected to the ostomy bag, ensuring a secure fit. The user can easily change their pouch without having to remove the wafer. This line of ostomy supplies is best suited for people with liquid output. The flange features ConvaTec's special Durahesive material around the opening, which swells when it comes into contact with output. This creates a secure seal and protects stomal skin. This ostomy wafer adheres to the skin even when wet.