Ultra impulso inerts

Loved by 20,000+ women who stopped letting outfits decide what they wear.

Ultra impulso inerts

5.0 (1,097+ reviews)

Autumn Sale

$24.99

$50.00

50%

Off

#1 Choice for Confidence

👗 Used by brides, bridesmaids & beach girls alike

Color

Size

Strapless? Backless? Bikini?

These stay on - even when nothing else does.

"I forgot I was even wearing them."

Feels natural in everything.

Sweatproof.

Swimproof.

Color

Size

Add to cart

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Free Shipping Worldwide

Grailz 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.

Size

Chest

Waist

34-36

28-32

38-40

30-32

42-44

34-36

46-48

38-40

2XL

50-52

42- 44

3XL

54-56

46-48

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, Grailz 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.

Shipping Rates and Delivery

We offer free standard shipping on all orders, with no minimum purchase required.

Processing Time

Orders are typically processed within 1-2 business days.

Delivery Time

Standard shipping typically takes 3-7 business days.

Tracking Your Order

Once your order has been shipped, you will receive an email with a tracking number and a link to track your package.

The Grailz 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 Grailz 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.

"Grabbed these last minute for a friend’s July wedding, lots of dancing. I’m a 34 B, slipped the inserts into my usual bra, pressed them in place, and forgot about them until I peeled them off 8 hours later at 2 a.m. No shifting, no weird lines. Rinsed them in the sink and tossed them in my travel pouch. if I’m dressed, these are coming with me.."

Hailey M.

"After a busy day that started at the office and ended with meeting friends for dinner, I can say these inserts didn’t budge once. Throwing them into my purse for a quick change in the bathroom was so easy. They gave my outfit a smooth finish—no visible edges, just comfortable confidence from morning until late."

Vanessa S.

"I bought these to wear under a bridesmaid dress and was skeptical at first. To my surprise, they stayed perfectly in place through an outdoor ceremony, group photos, and hours of celebrations. No awkward shifting, and they gave my dress the subtle lift it needed. Now, I use them whenever I want a little extra support without the hassle of special lingerie."

Nicole M.

We stand behind our products. Exchanges and returns are FREE for 60 days.

Founded in Amsterdam

MORE THAN 50,000 HAPPY CUSTOMERS

Take advantage of this offer

Valentina | 03-07-2024

"When I saw they were having a flash sale on

TikTok, I had to take advantage. I was already

going to buy one anyway, but since I ordered

here, I got two for the original price!"

It really works!

Mariana | 31-01-2025

"When it arrived, I thought l'd ordered a size too small, but I kept trying and eventually managed to fit it on. I guess it wasn't meant to be easy, but it's totally worth it for the look!"

The quality is incredible

Victoria | 02-04-2025

I was hesitant at first because I'd had bad experiences shopping on TikTok before, but this brand didn't disappoint! The quality is incredible, and for the price, it's hard to beat."

Material Composition: Cotton-rich stretch denim

Fabric Type: Stretch twill weave.

Feel: Soft, flexible, and smooth.

Weight: Medium-weight denim, providing a classic jeans feel

To calculate your size, simply scroll up and click on "What's my size?" located near the color selection options.

Our Artificial-Intelligence sizing system calculates your body parameters and matches them with data from customers with similar body types, and their experiences with our sizes. This innovative method ensures a 97% accuracy rate.

Size

Chest

Waist

34-36

28-32

38-40

30-32

42-44

34-36

46-48

38-40

2XL

50-52

42- 44

3XL

54-56

46-48

Shipping Rates and Delivery

We offer free standard shipping on all orders, with no minimum purchase required.

Processing Time

Orders are typically processed within 1-2 business days.

Delivery Time

Standard shipping typically takes 3-7 business days.

Tracking Your Order

Once your order has been shipped, you will receive an email with a tracking number and a link to track your package.

Flawless Curves, Instantly

Instant Perfection

Get a natural lift and flawless curves in seconds.

Invisible & Seamless

Undetectable under any outfit—effortlessly discreet.

Unstoppable Hold

Stays put through water, sweat, and all-day wear.

Reuse & Refresh

Easy to clean and reuse—always ready to go.

See the difference? That could be YOU!

Whether it's a date night, a day at the beach, or just feeling fabulous , these inserts give you the lift and confidence you've been dreaming of.

The All-In-One Shaper

Features built-in cups, high waist, and adjustable straps for customizable shaping and lift, tailored to your unique fit

Confidence, Every Layer

Smooths, shapes, and supports so you feel empowered—whether at work, at events, or on-the-go.

Meet Melissa

Babes everywhere are LOVING it

Said their confidence skyrocketed instantly

Noticed a natural, flattering lift in their shape

Felt more comfortable and secure all day long

Thousands of women are already loving their new look—don’t miss out on the lift that’s changing lives!

Why Settle for Less When You Can Have the Best?

See how we outshine the competition—because you deserve nothing but perfection.

Shop now

Others

Tested for Comfort

Skin-Safe

Reusable Up to 50+ Wears

Invisible Under Any Outfit

Featured in Vogue & Forbes

Loved by 95% of Customers

Grailz vs. The Rest

Snatch Factor Jeans – isn’t just another pair of jeans—we’re redefining comfort and style. Our comparison chart makes it clear: we’re the go-to for those who want denim that’s both premium and practical, without compromise.

Shop now

Traditional Denims

Premium Stretch Denim

COTTON-RICH (SOFT & FLEXIBLE)

Soft & Breathable

Medium-Weight (Year-Round Wear)

Multiple Color Options

Free Worldwide Shipping

Ultra impulso inerts

$24.99

$50.00

Save

50%

$50.00

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Add to cart

5 Stars On TrustPilot

Excellent 4.9/5

Quick & Easy

Marisa T | 04-03-2025

"They arrived relatively quick and they were super easy to put on. i am normally a DD so i got them in the size D and it worked out perfectly, you cant even tell im wearing them! i was shocked at the amount of lift they gave i mean look!! Big titty friendly!😩"

Good glue to hold it together

Amelia | 03-07-2024

"Good product, will serve for what I need. I tested and the glue is good."

Quick Delivery

Annie | 10-07-2024

"Good shape and sticks well. Delivered quickly to the Netherlands."

Useful

Ezrah | 04-03-2024

"Product is good and was very useful."

Covers well

Laura | 04-03-2024

"They are sticky inside, the surface is pleasant , doesn’t see through the clothes"

My New Go-To Inserts

Harper | 31-01-2025

"Ok. Listen up right now. I’ve tried them all and these are THE BEST. These ones are the real real deal like do not move. They stay on through sweat, water, all the above. They don’t stick out on the sides or top at all and make your boobs look so naturally big not like fake big. You cannot tell you’re wearing them at all. I’ve been searching for soooo long for ones to wear in swimsuits and I’m so freaking happy I found them. Save the damn boob job, get these. I’ll wear these things till I die"

Kept my tits together, lol

Evelyn | 10-09-2024

"I went to an edm concert with hard dubstep music. I was head banging and jumping up and down so hard I think my brain dislodged in my head. I was soaking head to toe. But my Grailz inserts faithfully stayed with my tits all night and were still sticky when I came home. I would 100% recommend and buy again"

Highly recommended

Josie | 11-03-2024

Everything is as described. arrived quickly. recommend!

Fits B cup

Shopper | 11-03-2024

"corresponds the description. Also, size for my B cup i would recommend 10 cm instead of 8 cm. quick delivery"

Noticeable difference!

Abigail | 03-07-2024

"Loved them! Such a noticeable difference! Won’t come out of my swimwear either!"

Worthy Investment!

Victoria | 02-04-2025

"I wish I knew about these sooner! I have always been self conscious wearing a bikini because there’s no support and I couldn’t hide behind a push up bra.. LOL. I love that these stick to your skin and your bikini. You’ll be happy you have them when you need them!"

Love it

Jane | 06-03-2025

"These are sensational. Literally like a boob job without the side effects. I’ve never felt so confident in my bathing suit and tops. They do not budge once you put them in. Many thanks for a great product!"

Best Sticky Bra

Zoey | 09-04-2025

"This is the best sticky bra i've ever owned, and I've tried several different kinds. It stays in place all night and gives me great lift without adding a huge amount of padding. I've worn them with so many different tops. So glad I found these!"

We Get These A lot

While all bodies are different and results may vary slightly, the Grailz Ultra Boost Insert is specifically designed to boost two cup sizes on women with smaller cup sizes, and up to a cup size on women with larger cup sizes.

Washing the Ultra boost Insert is a breeze!

We generally recommend that the Grailz Boost Insert be hand washed gently for best results and longest life span.

Ultra Boost Insert can be worn with all bikinis!

Ummmmmmm..... YES! Just ask one of our 20,000+ happy customers!

Of course! We love our products at Grailz and we're confident that you will too!

But in case things haven’t gone to plan - read about how we can help here.

At Grailz we offer free shipping worldwide!

Ultra impulso inerts

MORE THAN 50,000 HAPPY CUSTOMERS

Flawless Curves, Instantly

Instant Perfection

Invisible & Seamless

Unstoppable Hold

Reuse & Refresh

See the difference? That could be YOU!

The All-In-One Shaper

Confidence, Every Layer

Babes everywhere are LOVING it

Why Settle for Less When You Can Have the Best?

Others

Tested for Comfort

Skin-Safe

Reusable Up to 50+ Wears

Invisible Under Any Outfit

Featured in Vogue & Forbes

Loved by 95% of Customers

Grailz vs. The Rest

Traditional Denims

Premium Stretch Denim

COTTON-RICH (SOFT & FLEXIBLE)

Soft & Breathable

Medium-Weight (Year-Round Wear)

Multiple Color Options

Free Worldwide Shipping

Ultra impulso inerts

5 Stars On TrustPilot

We Get These A lot

Do they really boost 2 cups?

Are they easy to wash?

Can I wear them with a bikini?

Are they comfortable?

Can I return them?

Where do you ship?