They can be used in many occasions, such as potty training, bed wetting of children, and adult incontinence. Sized at 39”by 55”, the waterproof Incontinence pad Great for use on a bed, floor, couch, and other surfaces and furniture for complete protection Lay the pad lengthwise on a twin size mattress, and either lengthwise or crosswise on other mattress sizes for coverage everywhere you need it.