Our Technologies

Understanding convexity: Support for a more secure seal

Convexity is the outward curve built into some ostomy skin barriers (wafers). It applies gentle pressure around the stoma to help improve the fit and reduce leakage, supporting a more secure seal between the barrier and the skin.

1. Position theskin barrier above a flushstoma. This also works with retracted stomas or with skin folds.	2. The convex skin barrier exerts downwards pressure on the skin.	3. The pressure on the peristomal skin will help the stoma protrude further into the pouch, allowing for a better seal and helping to.

Why consider a Convatec convex solution?²

A convex pouching system may help if:

• You’re experiencing leakage
• Your stoma is level with the skin (flush) or pulled inward (retracted)
• Your abdomen has changed in shape or firmness
• You have skin folds, creases, or dips around your stoma

These factors can affect the way an ostomy system adheres to the body. Convexity is designed to improve the fit and help reduce leakage.

How convexity pouch systems work with a flush or retracted stoma¹

Convexity exerts downward and outward forces on the peristomal area to: 

• Encourage stoma protrusion (especially helpful for flush or retracted stomas)
• Flatten creases or skin folds that compromise adhesion
• Improve barrier‑to‑skin contact and seal reliability during movement

Five characteristics of convexity

Convexity performance is defined by five characteristics that help clinicians match the barrier to each patient’s anatomy:

• Depth: Is the distance between the highest point on the skin barrier and the base of the skin barrier.
• Compressibility: The maximum amount a convex skin barrier can be flattened.
• Flexibility: How easily the barrier bends.
• Tension location: Where the convex dome presses downward and outward on the area around the stoma.
• Slope: The angle between the highest point on the skin barrier and the base of the skin barrier.

These characteristics guide clinicians in selecting the minimum effective convexity needed to achieve a secure, reliable seal.

Not all convexity is the same

All bodies are different, so convexity choice should be based on patients’ needs and anatomy.

Find the right convex fit for your body

Convatec offers a wide range of convex options designed to fit different anatomies and lifestyles. Selecting the right convexity fit can help reduce leakage, protect peristomal skin, and support longer, more comfortable wear time.

Esteem Body™ with Leak Defense™

Our one-piece soft convex system is built to adapt to the body – because every body deserves to live without leaks.

Esteem Body™ with Leak Defense™ brings together our trusted hydrocolloid adhesives and a full convexity range to create a secure, longer-lasting seal.

• Available in 2 purposeful convex depths and 4 tension locations to help you find the right fit.
• Adhesives inspired by our hydrocolloid heritage – crafted to help users “get it right” the first time.
• Designed to support flush or retracted stomas, as well as abdomens with folds, creases, or loose skin.

1. Carmel J, Colwell J, Goldberg M, eds. Wound, Ostomy, and Continence Nurses Society Core Curriculum Ostomy Management. 2nd ed. Philadelphia: Wolters Kluwer; 2022. 2. Redmond C, Cowin C, Parkter T. The experience of faecal leakage among ileostomists. Br J Nurs. 2009 Sep 24-Oct7;18(17):S12-7.doi: 10.12968/bjon.2009.18.Sub6.44170. PMID: 19797994. © 2025 Convatec Inc. TM and R are trademarks of the Convatec group of companies. Convatec me+ is a trademark of Convatec. AP-77253-USA-ENGUv1
2. McNichol L, Cobb T, Depaifve Y, Quigley M, Smitka K,  Gray, M. Characteristics of Convex Skin Barriers and Clinical Application: Results of an International Consensus Panel. J Wound Ostomy Continence Nurs. 2021;48(6):524-532.