Prevail® For Women Maximum Absorbency Underwear. Size: Small/Medium. Waist size: 28" - 40" (71-102 cm). Hip size: 34" - 46" (86-117 cm). Prevail® Womens Underwear is ideal for moderate leakage associated with urge and mixed incontinence. It is designed specifically for the unique body shapes and needs of women, with a discreet and fast absorbing core. UOM:20/BG, 4BG/CS.