Convatec #125259 Sur-Fit Natura Cut-to-Fit, Stomahesive Skin Barrier with tape collar White 45mm (1 3/4") flange, Overall dimension 4" x 4" Sold by box of 10. The Sur-Fit Natura ostomy system is a comprehensive product line with our latest skin barrier technologies. The plastic coupling ring allows the pouch and skin barrier to snap together for audible security. Stomahesive skin barriers are ideal for people whose stoma output is semi-formed to formed. This reliable skin barrier provides a unique formula that enables the skin barrier to adhere to both dry and moist skin. It is gentle on skin yet holds firmly.