Boston ADVANCE Conditioning Solution contains an Advance Comfort Formula that is designed to disinfect, condition, cushion and wet rigid gas permeable contact lenses. The result is a soothing effect on your eyes, extending wettability on the lens, and reducing debris and deposit formation. Enjoy easy rinsing after lens wear. Lenses are recommended to be soaked for at least 4 hours (or overnight) before wearing. Note: This solution contains a patented multi-polymer cushioning system and a patented optimized preservative system to reduce eye irritation while being effective in killing harmful organisms when paired with Boston ADVANCE Cleaner.