Everyone who owns a pair of VForce grills knows how great of a goggle system they truly are, and many users end up owning them for many years. However over time even the best made masks will have their foam deteriorate or begin to smell from sweat. Obviously those signs would indicate new foam is needed, and luckily for you the Grills have a very easy replacement for the foam that also replaces the frame. New foam will instantly give your mask a new feel to it.