hydraSense Eye drops provide fast, effective, long-lasting relief of dry eye symptoms. Contains a naturally sourced lubricant sodium hyaluronate which is clinically proven to hydrate, lubricate and protect your eyes. Preservative-free formula comes in a multi-dose bottle with an innovative built-in filter that allows the formulation to stay sterile while keeping germs and bacteria out. Phosphate-free, preservative-free. Suitable for use with all types of contact lenses. Can be used for up to 12 months after opening.