Boston Advance Comfort Formula Conditioning System is the No.l doctor recommended two-bottle lens care system for GP (gas permeable) lenses. Boston Advance Comfort Formula Conditioning Solution and Boston Advance Cleaner are easy to use and provide lens wearing comfort. Boston Advance Comfort Formula 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. Boston Advance Cleaner removes dirt and debris from your lenses, leaving your lenses clean, clear, and ready to be disinfected. Boston Advance Cleaner is visibly tinted and formulated for improved rinsing