I do not have the Polaris2, but I have tried the SpinFit 360 on the Io and they do fit. I use the CP100 regularlly on the Io and Jupiter. I am pretty sure but not 100% certain that they would also fit on the Polaris2 as the sound tube/nozzle geometry looks pretty similar. The internal ribbing (or whatever you call the molded in ridges that grip the earphones) are not identical on the 100 and 360, but the inside diameter is really close...3.8 mm for the 100 and 3.6 mm for the 360. If the CP100 are loose for you, not sure the 360 will be enough of a change.