ConvaTec Sur-Fit Natura Convex Insert for use with 38mm Skin Barriers, Fits 25mm Stomas

ConvaTec Sur-Fit Natura Convex Insert for 38mm Skin Barriers, Fits 25mm Stomas

The ConvaTec Sur-Fit Natura Convex Insert is a snap-in accessory that adds convexity to a standard flat Sur-Fit Natura skin barrier. It is designed for people whose stoma is flush, retracted, or recessed, where a flat wafer alone may struggle to hold a secure seal. This particular insert is engineered for the 38mm flange and fits a 25mm (1 inch) stoma, using ConvaTec's color-matched system—this one is orange—to help you confirm the correct pairing at a glance.

The insert simply snaps into the flange/ring of your existing Sur-Fit Natura skin barrier, gently pressing the peristomal skin down and outward so a difficult stoma protrudes further into the pouch. That added convexity encourages output to flow directly into the pouch instead of undermining the seal, which can mean fewer leaks, better skin protection, and greater day-to-day confidence. Because it works within the two-piece Sur-Fit Natura coupling, you keep the convenience of changing your pouch without disturbing the barrier.

This insert is sold as a Box of 5 and is sized for a 38mm flange with a 25mm (1 inch) stoma opening. Like other ConvaTec ostomy products, it is not made with natural rubber latex and is FSA/HSA eligible. To ensure a proper fit, confirm your flange size and stoma measurement, then select your option below.

Frequently Asked Questions

Q: What does a convex insert actually do?
A: It snaps into the flange of a standard flat skin barrier and adds convexity, applying gentle pressure around the stoma so a flush or retracted stoma protrudes more, helping direct output into the pouch and improving the seal.

Q: Which barrier and stoma size does this insert fit?
A: This insert is made for a 38mm flange and a 25mm (1 inch) stoma opening. Always match the insert to both your flange coupling size and your stoma size.

Q: Why is the insert orange?
A: ConvaTec uses a color-matched system to make it easy to identify the correct size at a glance. The orange color corresponds to this specific size combination.

Q: Is this a skin barrier or a pouch?
A: Neither—it is an accessory insert that adds convexity to a compatible flat Sur-Fit Natura skin barrier. You still use your standard barrier and pouch with it.

Q: Is it latex-free and FSA/HSA eligible?
A: Yes. It is not made with natural rubber latex and qualifies as an FSA/HSA eligible ostomy supply.