Boston Conditioning Solution Advance Comfort is a maintenance solution for rigid gas permeable contact lenses with a powerful disinfecting action. The product is intended for use with rigid gas permeable, semi-rigid and scleral lenses . It is not suitable for soft contact lenses. It is the second step for the maintenance (wetting, softening, disinfecting) of your lenses at night and for hydrating them before and during use. The dual disinfection system provides excellent protection against harmful microorganisms and includes a patented system for forming a moisture layer that soothes your eyes.