We usually tell customers to use the same size Comply tip as you would with silicone tips. Size will make a difference in retention and noise reduction. However, since our foam tips are compressible to insert and then expand in your ear, we have found that the medium size fits most users comfortably.
All purchases from our website are backed by our Guaranteed Fit Program. If you have any issues with the size, let us know and we will provide you a store credit for you to use on the correct size. You only have to pay for shipping!