300cc Breast Implant Sizers

Drag the slider to compare the same model without sizers and wearing 300cc 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:

You already own an Oumènta kit. Add 300cc to fill a gap in your range, or to compare it with the sizes you're already wearing.

You want to try 300cc at home in your own bra. If you mainly want to see how 300cc 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 300cc. Spend more time with the size before your consultation, through workdays, weekends, and different outfits.

You keep seeing 300cc in your research. If it's the size you keep coming back to in photos and forums, wearing it yourself is the quickest way to find out whether it's really your size.

Try the Sizes on Either Side. Compare 25cc steps with our 275cc and 325cc sizer pairs, or 50cc steps with our 250cc and 350cc pairs.

Compare Two Sizes Side by Side. Try our 250cc vs. 300cc 2-Pack, 300cc vs. 350cc 2-Pack, 275cc vs. 300cc 2-Pack, or 300cc vs. 325cc 2-Pack, each with a Pocket Bra.

Compare Three Sizes. Explore our 250cc vs. 300cc vs. 350cc 3-Pack, 200cc vs. 250cc vs. 300cc 3-Pack, or 300cc vs. 350cc vs. 400cc 3-Pack, or build a custom kit with any three sizes.

Why 300cc Looks Different on Different Women

Your frame. The same 300cc often looks fuller on a petite frame and more moderate on a taller or broader one.

Your chest width. A wider chest spreads volume across more space, so 300cc may look less projected.

Your existing breast tissue. 300cc added to very little tissue can look like a bigger change than 300cc added to a fuller starting size.

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

See how 300cc looks on a real model in What Do 300cc Breast Implants Look Like?

How Does 300cc Compare With Nearby Sizes?

300cc has 20% more sizer volume than 250cc, and 350cc has about 17% more than 300cc. That doesn't mean your breasts will look 20% or 17% larger. The percentage describes the volume of the sizer, not your overall breast size.

For a closer look at the step down, read 250cc vs. 300cc Breast Implants: Is 50cc Noticeable?

Three Ways to Judge 300cc at Home

The button-up test. Try a fitted button-up shirt or blouse. Notice how it fits across the chest and whether you'd want it to fit that way every day.

The swimsuit test. Put on a swimsuit or bikini top. Swimwear shows volume more honestly than most everyday clothes.

The one-step test. If you own a kit, wear 300cc one day and the size above or below it the next. Notice which one you miss when you take it off.

What Cup Size Is 300cc?

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

Wondering whether 300cc is in your range? Try our Breast Implant Size Calculator, or read Breast Implant Size Calculator: What Would 300cc Look Like on Me?

For more about choosing a size, read How to Choose the Right Breast Implant Size and What's the Average Breast Implant Size?, or browse our full Breast Implant Sizing Guide.

How big is 300cc?

300cc is 300 milliliters of volume per breast, about 10 fluid ounces. How big it looks depends on your frame, chest width, and existing breast tissue, not the number alone.

Is 300cc a big implant?

300cc is in the middle range of commonly discussed implant volumes. On a petite frame it can look full; on a broader frame it can look moderate. Wearing 300cc sizers shows you how it looks on you.

Should I get 300cc or 350cc breast implants?

That's a decision for you and your plastic surgeon.