A sterile aqueous buffered, slightly hypertonic solution containing a cationic cellulose derivative polymer, a cellulosic viscosifier, polyvinyl alcohol, and derivatized polyethylene glycol as wetting and cushioning agents; preserved with chlorhexidine gluconate polyaminopropyl biguanide, and edetate disodium. Boston ADVANCE Advanced Comfort Formula System is a two-bottle lens care system for GP (gas permeable) lenses. Boston ADVANCE Conditioning Solution and Boston ADVANCE Cleaner's two-step system are easy to use and provide lens wearing comfort. Boston ADVANCE Conditioning Solution dual disinfecting system delivers excellent protection against harmful microorganisms. Includes a patented cushioning system to soothe your eyes and provide lens-wearing comfort.