ConvaTec 401577 (70 mm) SUR-FIT Natura® Stomahesive Skin Barrier is one among the Two-Piece Ostomy System (i.e. ConvaTec’s most extensive two-piece product line) of ConvaTec. The SUR-FIT Natura® Flange System (skin barrier/baseplate/wafer without tape collar) when used with the drainable pouch signals a secure, accurate closure with a series of audible “clicks”. A simple snap-off, snap on design allows users to change the pouch quickly to match activities without removing the skin barrier from the skin.