Breast Implant Size, Shape and Profile: How These Decisions Work Together

Dr Scott J Turner | Specialist Plastic Surgeon (FRACS) | Sydney

Breast implant planning isn’t a single decision. Patients sometimes arrive at consultation focused on one variable, often a CC number they’ve seen online, and they’re surprised when the conversation broadens. The reality is that implant size, shape, and profile aren’t separate choices. They’re linked dimensions that have to fit your specific anatomy.

For a full overview of the procedure and the consultation process, see the main breast augmentation procedure page.

This guide explains how the three core implant decisions interact. Why a 300cc implant can look quite different on different patients. Why high profile isn’t simply “bigger”. Why round and anatomical implants behave differently. And why the final selection is best made after measurements rather than from a cup-size target or a favourite photo.

As a Specialist Plastic Surgeon (FRACS), I consult at Bondi Junction in the Eastern Suburbs and Manly on the Northern Beaches. Every breast augmentation I perform is carried out at an accredited Sydney private hospital with a specialist anaesthetist.

What Breast Implant Size Actually Means

Breast implant size describes volume, measured in cubic centimetres (cc). A 300cc implant displaces 300 cubic centimetres of space.

What size doesn’t describe:

• Your final cup size (bra cup sizing varies between brands and isn’t a reliable surgical target)
• How the implant will look on your specific body
• The dimensions of the implant itself (two 300cc implants can have very different widths and projection)

A 300cc implant looks moderate on one patient and more noticeable on another because the same volume behaves differently depending on breast width, chest wall shape, tissue coverage, and the implant’s profile.

For a deeper dive on CC volume and how it interacts with frame, see the breast implant size guide.

The Three Dimensions That Matter: Width, Projection, and Volume

Implant dimensions come down to three measurements that work together. Volume is the one patients focus on, but the other two matter equally.

Profile isn’t a single number. It’s the relationship between base diameter, projection, and volume. At the same volume, a narrower base width generally means more projection. A wider base width generally means less projection. The trade-off between width and projection is the core of profile selection.

Breast Base Width: Why Your Frame Sets Limits

Breast base width is often more important than the CC number. It’s the horizontal footprint of your existing breast across the chest wall, measured at consultation in centimetres.

If the implant base width exceeds your natural breast footprint, two things can happen over time: lateral fullness that extends past the natural breast border, and visible implant edges that wouldn’t show on a narrower implant. Lateral displacement of the implant pocket is also more common when the width is wrong.

If the implant base width is too narrow for your frame, the implant doesn’t fill the breast base. The result can leave a visible gap between the implant and the breast border, and the final silhouette can look under-filled.

A patient with a 12cm breast base width has a different available size range than a patient with a 14cm base width. Volume choices flow from width, not the other way around.

What Breast Implant Profile Means

Profile is one of the most misunderstood terms in breast augmentation planning. It’s not simply “small to large”. Profile describes the shape of the implant in three dimensions.

Implant profile categories:

• Low profile. Wider base, less forward projection. Suits broader frames or patients wanting subtle projection.
• Moderate profile. Balanced width and projection. The most common starting point in current practice.
• Moderate plus profile. Slightly more projection at a similar base width.
• High profile. Narrower base, more forward projection. Suits narrower frames.
• Extra-high profile. Maximum projection with the narrowest base. Selected use.

Profile naming isn’t fully standardised across implant manufacturers. A “moderate plus” from one brand isn’t identical to a “moderate plus” from another. At consultation, profile selection is driven by measurements rather than by the marketing label.

For a deeper technical breakdown, see the breast implant profile and projection blog.

Moderate Profile Breast Implants

Moderate profile breast implants are designed to balance base width and projection at a given volume. They produce a softer, less projecting result than high profile implants at the same CC, and they’re the most common starting point in current practice.

When moderate profile may suit a patient:

• The breast footprint is wide enough to accommodate the implant base
• The patient wants a softer, less forward-projecting silhouette
• Existing tissue cover is adequate to soften the upper pole
• A subtle, proportionate increase is the goal

When it may not suit:

• The base width is narrow and a moderate-profile implant of the desired volume would exceed the natural footprint
• The patient wants more upper-pole fullness than a moderate profile delivers at their available base width

Moderate profile isn’t automatically the right choice. It’s the right choice when the patient’s measurements and goals point to it.

High Profile Breast Implants

High profile breast implants are not simply “larger” implants. They concentrate volume into a narrower base with more forward projection.

When high profile may suit a patient:

• The breast base width is narrow and a moderate-profile implant of the desired volume would extend past the natural footprint
• The patient wants more upper-pole fullness within a smaller footprint
• The chest wall is narrow but the patient wants more projection

When it may not suit:

• The chest wall is broader and high profile would look disproportionately forward-projecting
• Soft tissue cover is thin and the more forward implant edge becomes more visible
• A subtle, less projecting result is the goal

The decision between moderate and high profile usually comes down to base width matched to volume. Both are valid options. The right one is the one that fits your anatomy and the silhouette you’re looking for.

How the Same CC Volume Can Look Different

300cc isn’t a single look. The same volume can appear quite different across patients depending on the implant’s width and projection, and the patient’s chest wall, tissue coverage, and skin envelope.

This is why a 300cc photo from someone else’s gallery doesn’t predict what 300cc will look like on you. The CC is one variable in a multi-variable equation.

For more on reading gallery photos, see the guide to assessing before and after photos.

Breast Implant Shape: Round vs Anatomical

Two main implant shapes are available in current practice:

Round implants. Symmetrical from all angles. The most commonly used shape in primary augmentation. Rotation doesn’t change the appearance because the implant is the same shape in any orientation.

Anatomical (teardrop) implants. Shaped to mimic the natural slope of the breast, with more volume at the lower pole. Suits specific anatomy and aesthetic preferences. Because anatomical implants are shape-specific, rotation can alter the visual outcome if the implant moves within the pocket.

Round is the more common choice in current Australian practice. Anatomical implants still have a place in selected cases. For more detail, see the round vs teardrop breast implants guide.

How Size, Shape, and Profile Work Together

This is the central point. The three decisions are linked.

You don’t choose “300cc round high profile” in the abstract. The conversation works backwards from measurements:

1. Breast base width sets the implant width range you can work with
2. Chest wall shape and tissue coverage narrow that range further
3. Aesthetic goals (subtle, moderate, fuller silhouette) then point toward a profile
4. Round or anatomical shape is decided alongside profile based on anatomy and preference
5. Volume in cc falls out of the profile/width combination once those are fixed

The patient who arrives wanting “300cc round high profile” may end up with that exact specification. They may also end up with 280cc moderate plus profile because their measurements point there. The CC number is rarely the starting point in a measurement-led plan.

Implant Surface and Brand: Where They Fit In

Surface and brand sit after the size, shape, and profile decisions. Smooth and microtextured (Siltex) are the two main surface categories in current Australian practice. Macro-textured implants have been withdrawn from the Australian market because of their association with BIA-ALCL, a rare lymphoma.

The TGA began a post-market review of breast implants in 2019 and imposed regulatory conditions on breast implants remaining available in Australia. Mentor and Motiva are the two main brands in the Australian market, with products listed on the ARTG. Every implant placed is registered with the Australian Breast Device Registry (ABDR), which tracks long-term safety and performance.

For a brand comparison, see Motiva vs Mentor breast implants.

Why Anatomy Matters More Than a Favourite Photo

A common pattern at consultation is the patient who arrives with a saved photo and a specific implant size she’s seen quoted. The honest part of the conversation is that the same implant doesn’t reliably produce the same look on a different body.

What’s invisible in the photo:

• The patient’s height, frame, and chest wall dimensions
• Her breast base width and existing tissue volume
• The implant profile (often unlabelled)
• The placement plane
• The time post-surgery (early settling vs final result)

Photos are useful as reference points. They aren’t predictions. For more on reading gallery images responsibly, see the breast augmentation before and after gallery.

How Dr Turner Plans Implant Size, Shape, and Profile

The consultation process is tissue-based rather than CC-first.

What’s measured and assessed:

• Breast base width across both sides
• Chest wall width and shape
• Nipple-to-fold distance, with arm at rest and arm raised
• Soft tissue thickness via pinch test
• Skin quality and elasticity
• Existing asymmetry of volume, position, and shape
• Patient goals and lifestyle considerations

Sizers may be used to help patients visualise different options in clothing before committing to a final size. The implant brand and specific model are chosen at the end of this process, once the dimensions and shape are clear.

For consultation preparation, see preparing for your breast augmentation consultation in Sydney.

Common Mistakes When Choosing Implant Size, Shape, and Profile

A few patterns I see repeatedly:

• Choosing by cup size target
• Copying photos from someone with different anatomy
• Focusing only on CC volume and ignoring base width
• Assuming high profile is always preferable
• Assuming teardrop is always more suitable
• Exceeding breast base width to chase volume
• Ignoring tissue coverage in the size decision
• Not factoring in exercise routine, occupation, or future pregnancy

The implant choice lasts. A decision that fits your anatomy today is more likely to age well than one that’s pushing the limits of your frame.

Questions to Ask at Consultation

Bring these to your appointment:

• What is my breast base width?
• What implant width range fits my frame?
• Would moderate or high profile suit my chest wall?
• Would round or anatomical implants be more appropriate?
• How does my tissue coverage affect implant choice?
• Would a 250cc or 300cc implant look different on my frame?
• How will placement affect the result?
• What are the risks of choosing an implant that’s too wide for my anatomy?

Frequently Asked Questions

What is the difference between breast implant size and profile?

Size is volume, measured in cc. Profile is the relationship between the implant’s base width, projection, and volume. Two implants of the same size can have very different profiles, which produce different silhouettes on the same patient.

What does breast implant profile mean?

Profile describes the shape of the implant in three dimensions: how wide it is at the base, how far it projects forward, and how that relates to volume. Categories run from low through moderate, moderate plus, high, and extra-high. Profile naming isn’t fully standardised across manufacturers.

Are high profile breast implants bigger?

No. High profile means narrower base and more forward projection at a given volume. A high profile implant at 300cc isn’t larger than a moderate profile implant at 300cc. The volume is the same. The shape distribution is different.

Can the same implant size look different on different patients?

Yes. The same CC volume can appear quite different depending on the patient’s breast base width, chest wall, tissue coverage, skin envelope, and the implant’s profile. This is why CC alone isn’t a reliable predictor of how an implant will look on you.

How does Dr Turner choose implant size, shape, and profile?

Through measurement-based clinical assessment. Breast base width, chest wall dimensions, tissue coverage, skin quality, asymmetry, and patient goals all feed into the decision. The brand and specific model come at the end of this process, once the dimensions and shape are clear.

Next Step: Breast Augmentation Planning in Sydney

Choosing breast implant size, shape, and profile is a clinical planning process, not a single-variable decision. At consultation, I assess your breast width, chest wall, tissue coverage, skin quality, and goals before discussing which implant dimensions may be suitable.

For a full overview of the procedure, see the breast augmentation procedure page. To arrange a consultation, contact the practice.

A GP referral is required to book your first appointment.