Moisture and oxygen - all contact lens users know that these are the two main factors that make certain contact lenses comfortable and. Air Optix Aqua contact lenses provide both, thanks to special Aqua moiturizing system, which keeps your eyes getting exactly the amount of water they need, as well as special silicone hydrogel material, lotrafilcon B, which lets the oxygen flow freely to you eyes. Thanks to these features, Air Optix Aqua contacts can be not only worn on a daily basis for a month but also, you can occasionally sleep wearing them. Don't worry, your eyes are safe thanks to the excellent contact lens composition. Don't turn sleeping with these lenses into a habit though, for that purpose use Air Optix Night and Day Aqua contacts.