The best way to determine the size that fits your personal perception of the perfect breast is to try on sizers. This way you can see how they fit on you, how they add to your current volume, and whether they fit your frame. Although the surgeon can guide you, only you will be able to tell what is the right size. Try on sizers. Measuring a diameter and then telling the patient what volume they can have (in high, moderate or moderate plus implants) in my mind is backwards. The patients should be allowed to choose the volume. Then the surgeon carefully considers the base diameter, projection, profile, manufacturer, and fill material that will achieve the patients goals of size as well as qualitative look (natural, intermediate, or bold upper pole fullness or projection), all the while taking into consideration the patient's anatomic features that will affect the outcome. The experience of the surgeon and the degree to which they explain the options to you is of utmost importance. The subtlety in the final outcome is not achieved by which profile implant is used, it is determined by the skill in the creation of the pocket, the choice of implant. Don't let the doctor tell you what would look good on you. They cannot tell what you perceive to be the best size. That is up to you. Although under the muscle makes the implants look subtly smaller that the sizers look, it is completely unnecessary to upsize to compensate for this. This upsizing approach results in patients who are unhappy because they are too large. If you like a certain size, request that size, not the next one up. HP implants, which are a more modern shape than moderate profile implants, fit most women better. They have a more appropriate base diameter and can be made to look very natural or very augmented, depending on where in the range the implants are filled to achieve a particular volume. High profile implants are the first choice in my opinion. I rarely find an indication to use moderate or moderate plus implants. The subtlety in the final outcome is not achieved by which profile implant is used, it is determined by the skill in the creation of the pocket, the choice of volume, and where in the range the implant is filled.