Made out of exactly the same components as baby diaper covers; leakproof and washable. Breathable laminate outer - PUL (100% polyester) and "alova suede" or pul inner (100%polyester) Serged for superior durability. Hidden elastic around the legs and in the back for a snug fit. Hook & loop fasteners with fold back laundry tabs for a strong hold. FULLY washer and dryer safe ( medium heat ). Do not use bleach or fabric softener. Needs to be washed at least once before use.