Convatec NATURA® 416421 Closed-End Pouch, 12in., 1-Sided Comfort Panel, Tail Closure, Transparent, 2 1/4in. Flange, 10/bx (Continental US Only) Pouches are compatible with SUR-FIT Natura® Two-Piece Ostomy System which is ConvaTec’s most extensive two-piece product line. The SUR-FIT Natura® and Natura® + Flange System 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.