The Miru 1day Flat Pack is a conveniently portable disposable contact lens thanks to its 1mm flat pack. No need to worry about contaminating the inner surface of your contact lens. The flat pack was specifically designed to always have the outer surface of the contact lens facing up decreasing the chance that the inner surface gets contaminated. The poly (HEMA-GMA) lens material of the Miru 1day flat pack is a polymer with free hydroxyl radicals that naturally bond with water molecules to ensure maximum wettability and moisture retention. The evaporation rate of contact lenses usually increases in tandem with the water content. That is not the case with the Miru lenses because it exhibits a lower evaporation rate.