No clips or clamps to lose. Low-profile for discretion. Odor filter in every pouch. Extremely hygienic and secure. Better fits the contours of the body for comfort and discretion. Soft cloth on both sides of opaque bags. Prevents rustling for more discretion. Proprietary semi-permeable membrane lets gas pass through, but retains moisture and prevents leakage. Provides optimum skin-friendliness since the same material does not constantly touch the same part of the skin. Cut-to-fit and pre-cut with convexity. Opaque.