SOSecure Containment Swim Brief, Navy, X-Large 37″-40″. SOSecure Containment Swim Brief provides superior containment. Lightweight and stretchy, the adjustable Hook & Loop closure allows for a snug fit regardless of body shape. Although designed primarily for containment of solids, many customers find it useful for limited urinary incontinence. It also makes an excellent night diaper cover. Washable & reusable, the thin fabric fits discreetly under a swimsuit. Men: order by waist measurement. Women: order by hip measurement if larger than waist.