Biotrue is inspired by the biology of your eyes & is the only solution with the same p H & lubricant found naturally in your eyes. These natural ingredients create a solution that delivers unsurpassed cleaning & disinfection efficacy, thanks to their unique innovations, inspired by the biology of your eyes, combined with the dual-disinfection system. Biotrue also helps to keep certain beneficial tear proteins active, to maintain the health of your eyes & the comfort of wearing your contact lenses. This twin pack contains a two & half month supply of cleaning solution.