Stoma size: 15mm to 23mm diameterOpening type: Cut-to-fitConvexity: Convex lightBelt tabs: YesCoupling size: GreenSenSura click xpro has a double-layer technology comprising a darker skin-friendly contact layer and a lighter strong protection layerThe strong protection layer protects the skin from leakage and prevents the adhesive from eroding away from contact with stoma outputThe layer in contact with the skin absorbs sweat and moisture.. Thus, a barrier with a "red" coupling size must be matched to a "red" pouch.