Prevail Adult Diapers sometimes referred to as Adult Briefs are designed for maximum absorbency. Prevail Adult Diapers fasten with tape tabs and offer the highest level of protection available. Prevail provides a variety of adult diapers in both size and absorbency level. These sizes include Small, Medium, Large, to XL and Bariatric sizes. Prevail Adult Diapers are designed for protection of both fecal and urinary incontinence.