This 4 oz. Bottle provides lasting comfort with the convenience of a no rub solution. It is also effective at cleaning disinfecting and storing all types of soft contact lenses including silicone hydrogels. Opti-Free Express features a unique cleaning formula that provides triple action cleaning for your contact lenses. This formula not only allows your lenses to clean and condition themselves while in the case - it also helps keep contacts clean throughout the day by retaining moisture and preventing protein buildup.