300cc vs 350cc Breast Implant Sizers

Drag the slider to compare the same model without sizers and wearing 300cc Oumènta breast implant sizers.

External sizing demonstration only. Not a prediction of surgical results.

Choose your Pocket Bra by your current band size:

The Pocket Bra should feel snug and supportive, similar to a sports bra. There's no need to size up for this kit. The internal pockets are designed for the sizers and keep both sizes in the same position, so your comparison stays fair.

Want a Closer Comparison? Try our 300cc vs. 325cc 2-Pack or our 325cc vs. 350cc 2-Pack.

Leaning a Little Smaller? Compare our 250cc vs. 300cc 2-Pack or our 275cc vs. 325cc 2-Pack.

Leaning a Little Larger? Compare our 350cc vs. 400cc 2-Pack or our 325cc vs. 375cc 2-Pack.

Not Ready to Narrow It to Two? Add a third size with our 250cc vs. 300cc vs. 350cc 3-Pack or our 300cc vs. 350cc vs. 400cc 3-Pack, or build a custom kit with 300cc, 325cc, and 350cc. You can also choose any two volumes with our Choose-Any-2 Sizer Kit.

300cc vs. 350cc Breast Implants: How Different Are They?

350cc has 50cc more volume per breast than 300cc. That's about 17% more sizer volume, or roughly 3.4 tablespoons per side.

That doesn't mean your breasts will look 17% larger. The percentage describes the volume of the sizer, not your overall breast size. How either volume looks on you depends on your existing breast tissue, chest width, and frame, and after surgery also on implant profile and placement.

Is a 50cc Difference Noticeable?

Often, yes, but it depends on the clothes. Under a loose sweater, 300cc and 350cc may look similar. Under a fitted top, in a swimsuit, or from the side, the extra fullness of 350cc is usually easier to see.

That's why trying both in your real wardrobe matters. A difference you can barely see in a T-shirt may be the whole question in the dress you plan to wear most. For more on how 50cc can look, read 250cc vs. 300cc Breast Implants: Is 50cc Noticeable?

"What If 350cc Is Too Much?" "What If 300cc Isn't Enough?"

These two worries usually show up together. Neither size is right or wrong. The useful question is which one feels like you after a few ordinary days, not which one looks better in a photo for a few seconds.

Some women find that 350cc feels natural sooner than they expected. Others find that 300cc gives them exactly the change they wanted. Wearing both is how you find out which group you're in. For more on this worry, read 275cc vs. 375cc: Will You Regret Going Too Big or Too Small?

How to Compare 300cc and 350cc at Home

The reach-for test. For a week, choose freely each morning which size to wear. Keep a tally. The size you pick more often, without overthinking it, tells you a lot.

Dress up and dress down. Wear 350cc to something special and 300cc on an ordinary day, then swap. Some women want different things from the same size depending on the occasion. Notice which size works for both.

Check the side view. A 50cc difference often shows most in profile. Take side photos in the same fitted top with each size.

Ask the disappointment question. Imagine your surgeon says, "Let's go with 300cc." Are you relieved or a little let down? Then imagine 350cc and ask again.

Bring your tally and photos to your consultation. They give your surgeon a concrete sense of the look you prefer.

What About 325cc?

325cc sits exactly between these two sizes. If 300cc feels slightly too modest and 350cc slightly too full, that's a useful finding, and you can test the middle with a 25cc 2-Pack or a custom kit. For a closer look, read 325cc Breast Implant Sizers: Before and After.

Will 300cc or 350cc Give Me a C or D Cup?

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.

Explore Individual Breast Implant Sizer Sizes

Learn more about our 300cc breast implant sizers, 325cc breast implant sizers, and 350cc breast implant sizers, or try our Breast Implant Size Calculator for a suggested range of sizes to try.

For more about choosing a size, read What's the Average Breast Implant Size?, 350cc vs. 450cc Breast Implants: Which Size Is Right?, and How to Choose the Right Breast Implant Size, or browse our full Breast Implant Sizing Guide.

How much bigger is 350cc than 300cc?

350cc has 50cc more volume per breast, about 17% more than 300cc. The visible difference depends on your body and your clothing, and is often easiest to see in fitted tops and from the side.

Is 350cc too big?

Not necessarily. Whether 350cc looks proportionate depends on your frame, chest width, existing breast tissue, and the implant profile your surgeon recommends. Wearing 350cc sizers under your own clothes shows you how that volume looks on you.

Should I get 300cc or 350cc 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.

Why buy a 2-Pack instead of a 3-Pack?

If you've already narrowed your choice to 300cc or 350cc, a 2-Pack focuses on just those two sizes, at a lower price. If you're still exploring, a 3-Pack adds a third size for a wider comparison.

How long should I compare the two sizes?

As long as you need. Many women find that a week of alternating sizes during normal activities makes their preference clearer than a single try-on. Remove the sizers if they become uncomfortable.

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.