400cc Breast Implant Sizers

Drag the slider to compare the same model without sizers and wearing 400cc Oumènta sizers.

Shown in the Oumènta Pocket Bra (bra not included with this pair). External sizing demonstration only. Not a prediction of surgical results.

For maximum discretion, we recommend the Oumènta Pocket Bra. Its internal pockets hold the sizers in place under your clothes, at work, at the gym, and out in public, and keep each size in the same position so your comparisons stay fair.

For trying the sizers at home, they can also be worn in a snug sports bra or a full-coverage bra.

Already own an Oumènta kit? Your Pocket Bra works with this pair. If you're buying a Pocket Bra with a kit, choose it by your current band size:

If you have a 32" band or smaller and plan to try sizes over 400cc, choose Small (S) for extra room.

You already own an Oumènta kit. Add 400cc to extend your range, or to compare it with the sizes you're already wearing.

You want to try 400cc at home in your own bra. If you mainly want to see how 400cc looks at home, a single pair worn in your own sports bra or full-coverage bra may be all you need. If you'd also like to wear them out in public, a full-coverage bra or an Oumènta Pocket Bra you already own works best.

You've narrowed your choice to 400cc. Spend more time with the size before your consultation, through workdays, weekends, and different outfits.

You're not sure 400cc suits your frame. Seeing it on your own body in a full-length mirror is more useful than any photo of someone else.

Try the Sizes on Either Side. Compare 25cc steps with our 375cc and 425cc sizer pairs, or 50cc steps with our 350cc and 450cc pairs.

Compare Two Sizes Side by Side. Try our 350cc vs. 400cc 2-Pack, or choose any two volumes with our Choose-Any-2 Sizer Kit. Both include a Pocket Bra.

Compare Three Sizes. Explore our 350cc vs. 400cc vs. 450cc 3-Pack, 300cc vs. 350cc vs. 400cc 3-Pack, or 400cc vs. 450cc vs. 500cc 3-Pack, or build a custom kit with any three sizes.

Why Proportion Matters More Than the Number

Your height. On a taller torso, 400cc has more space to sit within your overall silhouette. On a shorter torso, it can take up a larger share of your upper body.

Your chest width and shoulders. A wider chest and broader shoulders spread the visual weight of 400cc. A narrow chest concentrates it, which can make it look more projected.

Your hips. Many women judge balance by comparing their bust line with their hips. 400cc can look proportionate on one figure and top-heavy on another.

After surgery, implant profile and placement also affect how a given volume looks. Your plastic surgeon will assess these with you.

How Does 400cc Compare With Nearby Sizes?

400cc has about 14% more sizer volume than 350cc, and 450cc has 12.5% more than 400cc. That doesn't mean your breasts will look 14% or 12.5% larger. The percentage describes the volume of the sizer, not your overall breast size.

Considering going larger? Read 400cc vs. 500cc Breast Implants: How Much Bigger? Or compare a smaller range in 350cc vs. 450cc Breast Implants: Which Size Is Right?

Three Ways to Judge 400cc at Home

The full-length mirror test. Look at your whole figure, not just your chest. Does 400cc look balanced with your shoulders and hips?

The everyday-outfit test. Wear the clothes you live in most: jeans and a tee, workwear, or loungewear. Does 400cc look like you on an ordinary day?

The step-down test. If you own a kit, wear 400cc one day and 350cc or 375cc the next. Notice which one you miss when you take it off.

What Cup Size Is 400cc?

There's no reliable conversion between implant volume and cup size. The same volume can look different on two women, and cup sizes vary between bra brands. Oumènta sizers show you external volume under clothing; they can't predict your cup size after surgery.

For more on volume and cup size, read A Cup to C Cup Breast Implants: How Many CCs?

Why Try Sizes Before Surgery?

In a published study of 567 women, a group who tried silicone implant samples in a bra before surgery generally reported that the preoperative sizing process was helpful. The study used implant samples, not Oumènta sizers, and doesn't show that Oumènta products affect surgical outcomes.

Read the published preoperative sizing study.

Keep Exploring

Try our Breast Implant Size Calculator for a suggested range of sizes to try, or read How to Choose the Right Breast Implant Size. You can also browse our full Breast Implant Sizing Guide.

Will 400cc look huge?

It depends on your frame. On a taller woman with a broader chest, 400cc can look full and balanced; on a petite frame, it can look much more prominent. Wearing 400cc sizers shows you how it looks with your proportions.

Is 400cc too big for a petite frame?

Not necessarily. Some petite women choose 400cc and like the result; others find it more than they want. Seeing 400cc on your own body in a full-length mirror helps you decide, and your surgeon can advise on what your anatomy allows.

Should I get 350cc or 400cc breast implants?

That's a decision for you and your plastic surgeon. Wearing both sizes at home can help you understand which look you prefer. Your surgeon will assess your anatomy and recommend implant dimensions that suit you.

Can I wear 400cc sizers without the Pocket Bra?

Yes. For trying them at home, the sizers can be worn in a snug sports bra or a full-coverage bra. For wearing them discreetly in public or through a full day, we recommend the Oumènta Pocket Bra.

Why buy a single pair instead of a kit?

A single pair is a good fit if you already own an Oumènta kit and want to add 400cc, or if you've narrowed your choice to this size. If you're still exploring, a 2-Pack or 3-Pack includes a Pocket Bra and lets you compare sizes side by side.

Will these sizers show me how my implants will look?

No. Oumènta sizers show external volume under clothing. They can't reproduce implant placement, tissue response, implant profile, or surgical results.