Ultra Boost Inserts

Bumbas Ultra Boost single-sided adhesive is lab-tested for water, sweat, and high-impact motion, so it grips your bra lining from yoga flow to pool plunge. 

The silicone flexes with every move, eliminating corner lift or shifting. 

Pop them in, press for three seconds, and you’re locked in for the day. 

Thousands of customers have sprinted, danced, and swum—no slips, just lift.

Our Ultra Boost Inserts are one-size. Your lift will vary based on your bra size — check the Lift Chart above to see what to expect.

We use hypoallergenic, medical-grade silicone approved for daily skin contact—even on ultra-sensitive types. 

No latex, no harsh glues, zero itch or redness reported in our wearer trials. Just a secure, gentle hold you’ll forget is there until you peel it off. 

Rinse, air-dry, and the adhesive refreshes for tomorrow.

Not a chance of spotting them! 

Each insert tapers to under 1 mm at the edge, melting into the cup so there’s no ridge under tees, lace, or silk. Skin-tone shades keep the look seamless in sheer tops and swimwear. 

Friends will notice your gorgeous shape, not what’s creating it. 

Confidence: on display; inserts: your little secret.

With a quick rinse in mild soap and an overnight air-dry, Bumbas Boost stays sticky and shape-perfect for at least 50 wears—often more. 

Alternating pairs (hello, 2-pack!) lets each set “rest,” extending life even further. More wears = lower cost per lift.

Silicone doesn’t make you hotter—it simply rests against your skin without trapping extra heat. 

Keep cool by wiping off any natural perspiration before placement—our adhesive is engineered to stay locked during sweltering summer walks, HIIT sessions, and pool days alike. 

The medical-grade material is naturally odor-neutral, and a rinse after wear keeps it fresh. 

Heavy sweater? Lightly dust baby powder under the bust and you’re breezy all day.

We are proud to offer fast & reliable shipping on all orders! Due to recent tariffs, shipping may take a bit longer than usual — but we're doing everything we can to keep things moving quickly!

Order processing usually takes 3-4 business days before shipment. Once shipped, the estimated delivery time is:

- USA: 8-12 business days
- Canada: 5-10 business days
- UK: 5-10 business days
- Rest of world: 6-14 business days

What’s the difference between Bumbas Boost and Ultra Boost?

Bumbas Boost is our premium option — it’s thicker, stickier (with double-sided adhesive), and adds more lift overall. It also comes in multiple sizes and colors so you can get the perfect match and shape for your body. Ultra Boost is a more minimal option with single-sided stickiness, available in one universal color. It still gives a nice lift, but how much depends on your cup size — smaller busts will see more of a boost than larger ones. If you want max volume and customization, go with Bumbas Boost. If you prefer something lighter and simpler, Ultra Boost is for you.

The Bumbas Ultra Boost Inserts work best with tight fitted, structured, tops and swimsuits.

They are not designed for loose fitted clothing, such as t-shirts.

We want you head-over-heels. Try Bumbas Boost for 60 days; if they’re not the confidence game-changer you hoped for, send them back for a full refund—no questions asked. 

Keep the bonus nipple covers as our thank-you for giving us a whirl. 

That’s how sure we are you’ll never want to be without them again.