Air Optix Aqua contact lenses from Alcon are made with a new silicone hydrogel material that allows up to 5 times more oxygen to flow through the lens than regular contact lenses. This means that the lenses provide a comfortable feel with great visual acuity for up to 7 days straight without removal. The contact lenses stay comfortable and wet due to the AQUA moisture system which helps reduce the rate of lens dehydration. These lenses are a monthly replacement contact lenses. Please consult with your optometrist for the wearing schedule that is best suited for your vision needs. There are 3 lenses in each box, however, you can also get these lenses in a 6 pack.