Ostomy ring barriers help ensure a better fit of the barrier system on curved body shapes or wrinkly skin, protecting against moisture and skin irritation. While not mandatory, barrier rings and seals are a welcome addition to any one-piece or two-piece ostomy system, especially if the peristomal skin is sensitive, already irritated, creased, or just uneven. Retracted stomas benefit greatly from convex inserts, which improve wearing time for ostomy bags of all types.