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Siren Reversible Bikini Bottoms

Regular price $149.00 AUD
Regular price $149.00 AUD Sale price $149.00 AUD
Taxes included.

Or pay in 4 interest-free instalments of $37.25 AUD with

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Easy Exchanges
Always Express Shipping
Worn & Loved by 100K+ Women

About this piece

Never afraid of the depths, always drawn to more. The Siren Reversible Bikini Bottoms bring together a delicate floral and retro-inspired stripe in Corallo Red, softened by hints of pink. Reversible by design, each side offers a different expression of Siren’s untamed femininity. Thoughtfully cut to sculpt, shape and flatter your natural shape, they deliver a secure, supportive fit with a smoothing feel, made for a woman who carries her softness through every storm.

Pair with the Siren Classic Bikini Top or Siren One-Piece Wrap Top to create a versatile reversible bikini set, with multiple ways to wear and a little more freedom to follow wherever the tide takes you.


Fabric

Our signature Italian swimwear fabric is made from 78% recycled polyester and 22% spandex, using regenerated fibres from pre- and post-consumer waste. Luxuriously soft yet firm, this high-performance fabric offers a structured, shape-controlling fit with supportive hold for A to H cups. Due to its technical construction, expect a firmer feel than conventional swimwear.

Size & Fit

Julia (blonde hair) wears a Size AU 6 Top + AU 8 Bottoms. Her measurements are:

Bust - 85cm
Waist - 63cm
Hips - 93cm
Height: 170cm 

Tanni (brown hair) wears a Size AU 6. Her measurements are:

Bust - 87cm
Waist - 59cm
Hips - 88cm

Sustainability & Care

The longevity of your Swimwear will ultimately come down to how it is cared for. To ensure your Baiia remains in perfect condition, please keep the following in mind:

  • Hand-wash only in cold water
  • Do not soak, bleach, rub or wring
  • Do not iron or tumble dry
  • Lay flat to dry only
  • Dry in the shade
  • To avoid fabric from drying out, ensure any sand is removed from the garment.

Shipping & Returns Policy

DELIVERY TIMES

Standard:

  • Australia Post Express: 1-3 Business Days
  • DHL Express (NZ Customers): 3-5 Business Days


AUSTRALIA AND NEW ZEALAND SHIPPING COSTS

  • Express Shipping over $300: FREE
  • Express Shipping under $300: $11 (AU) $15 (NZ)


DISPATCH TIME

Allow up to 1-3 business days to dispatch from Baiia offices. Read our full Shipping & transit protection T&C's here

RETURNS

All full-price change of mind returns will be accepted for online store credit or an exchange. You have 30 days from the date you receive your order to lodge a return for credit request or an exchange via our online returns portal. All returned items must be returned in as-received condition, unworn, unwashed, with hygiene liners and swing tags in place. Read our Returns terms and conditions here.

Frequently Paired With

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Siren Reversible Bikini Bottoms

$149.00 AUD

Size 6 selected

Siren Reversible Bikini Bottoms

Siren Reversible Bikini Bottoms

$149.00 AUD

HOW IT WORKS

MADE TO MOVE WITH YOU

ADJUSTABLE SUPPORT

ADJUSTABLE SUPPORT

Each Baiia swim piece is customisable with waist ties or style shifters so you can adjust your bust support and coverage, your way.

BUILT-IN SMOOTHING & SCULPTING

BUILT-IN SMOOTHING & SCULPTING

Double and triple-lined fabric do the work of shapewear, hugging your shape and smoothing as you move, without harsh lines, digging, or discomfort.

NEVER JUST ONE WAY TO WEAR

NEVER JUST ONE WAY TO WEAR

Our patented reversible design ensures both sides are fully wearable, so you're never just buying one suit - you're getting multiple looks in one.

THEIRS VS OURS

SEE & FEEL THE DIFFERENCE

Before and after comparison

OTHER BRANDS

Cheap & Flimsy Fabric
Unstructured, Generic Construction
No Compression or Shaping
Only one way to wear

BAIIA

Recycled Italian Fabric
Patented Innovation & Construction
Built-In Smoothing & Shaping
More than One Way to Wear

Overall rating: 4.5408273 / 5 from 943 reviews.

AI Generated Review Summary

The Siren Reversible Bikini Bottoms are praised for their high-quality fabric and flattering design. Customers appreciate the reversible feature and the supportive fit, making them a standout choice for beachwear. While some customers reported sizing issues, the overall quality and comfort are highly regarded.

Summary topics

  • Fabric Quality (12%): It was highlighted by customers that the fabric of the product is great and of top quality.
  • Swimsuit Design (7%): Customers raved about the Baiia swimsuit, praising its fit, support, and flattering design.
  • Comfort (10%): Customers expressed satisfaction with the feel of the Baiia swim wear, describing it as flattering and comfortable.
  • Colour Appeal (12%): It was reported by customers that the colour of the product is highly praised and loved by many.

Review topics: ["feel","fit","quality","issue","size","fabric","material","felt","look","coverage","design","colour","waist","customer service","style","shipping","pattern","cut","versatility","bottoms","shape","lining","measurements","suit","butt","confidence","comfort","swimsuit","construction","value"].

Review highlights

  • "Love love love the fit, styles, colours options but most of all love the sustainability of the swimwear" — Kylie P.
  • "They fit nicely, have a good shape and high quality fabric." — Jeanette H.
  • "Size 10 I love everything about this bikini, Fits me perfectly, great quality, and beautiful color." — Judith Z.

Reviews

As expected, I finally got

"As expected, I finally got the right size and it does make me feel very slim. The wrap top doesn't quite boost up the ladies as much as I would like with no passing, but it looks good still. Love the vibrant pattern and the high quality fabric."

— Matty E. (5/5)

I loved the suit but

"I loved the suit but it was too small and needed a simple exchange, now I will be asking for a refund . I sent my order back for a size exchange a month ago and have not received a email confirmation that you even received it. I emailed your company 2 weeks ago for a status update and was told they would be processing my exchange soon but so far no other communication. You seem to be able to send a ton of marketing emails but not updating customers on orders."

— Lora H. (1/5)

The next big thing in swimwear

"Love the high waist for my mature body, and it is very comfortable to wear once I got my size right. Exchanges were hassle free and stressless. Gorgeous style and extremely comfortable. I am in love with this brand and its innovative approach to swimwear for women. the 2-piece options mean it can fit any shape and body image issues just go away."

— Lorin H. (5/5)

Size tip for North American

"Size tip for North American girlies: measure yourself before ordering, and err on the larger size if in doubt. The bottoms do seem (to me) to fit small. Either that, or I’m in denial about my growing perimenopausal posterior ;) Regardless, I’m happy with my purchase, and the versatile looks I can get between this and the wrap top! Four stars reflect my wish for an economical means of trying different sizes before committing to spending so much on a swimsuit."

— Stephanie E. (4/5)

Love it

"I really like how high it goes, you can make it look like a one piece. Once on it’s really comfy but I get what people mean it’s not a stretchy ad a normal swimsuit. I got it on though and once on it feels fine but it was a bit of a battle. Really love the look and feel of this swimsuit. It’s like having a million in one all the ways you can style it!"

— Teagan (5/5)

The best bottoms

"LOVE these bottoms! I ordered a size smaller than normal and so glad I did. They are snug to get on but once on, they do not move, no NOT roll down, and are so comfy!"

— Amanda C. (5/5)

Good quality but I chose

"Good quality but I chose the size badly. The webpage stated that the model had 100cm hips and was a size 8. I couldn't get the 8 over my hips!"

— Michelle R. (3/5)

Stunning print and great fit

"I was unsure about sizing as I'm 12/14. The 14 was sold out so I risked it and I'm so happy i did. Im an hourglass shape so having the firmer fit worked better for my waist. These are smoothing and flattering on."

— caitlin k. (5/5)

Love Love Love!! I am

"Love Love Love!! I am very happy with these and as a added bonus helping an Australian Business."

— Kerrie D. (5/5)

dissapointed

"uncomfortably small and tight, yet the leg openings hang open and are not tight on my bottom, so a larger size wouldnt work for me."

— Alisha R. (2/5)

Q&A

Behind the Design

It was 2016, I had just stepped into womanhood, and with that, was accepting the new shape my body was taking. I was looking for a swimsuit that actually made me look like the woman I knew I was, but was also becoming. Something that accentuated my shape, held me the way I now needed to be held, moved with my body across every season of my life, and came from a place of care for the environment around me. I couldn’t find it. So I decided to make it myself.

I became hooked on creating the dream swimsuit, pieces that didn’t ask you to mould yourself into them, but instead moulded themselves around you. Reversible designs that give you more, unique sizing that honours your shape instead of boxing it, cuts that work whether you’re 29 or 79, pre-baby or post-everything.

Before I knew it, I found myself surrounded by an incredible community of women from everywhere, every size, every stage. They weren’t looking for the “latest trend” or an Instagram moment in a bikini. They just needed swimwear that actually worked:

  • Pieces that held them, supported them, made them feel like themselves
    Reversible cuts that gave them options, not limitations
  • Sizing that didn’t make them feel like they had to change to fit the mould
    Designs that moved through their seasons with them, not against them

That’s what Baiia is built on, women supporting women, and the belief that feeling good in a swimsuit shouldn’t require you to change yourself. That’s the swimsuit’s job.

I’m not here to make aspirational pieces for photoshoots. I’m here to make timeless designs that make you feel held, supported, celebrated, exactly as you are, even on the days you don’t feel like it. Because you deserve swimwear that loves you back.

If you choose to invest in Baiia, please know that I am forever grateful. This community, these women, this belief that we can design our way forward, feeling better in our own skin because we finally realised we don’t have to change.

Thank you for being here. For taking a chance on a brand built simply because one woman wanted to create pieces that held us through the many seasons of womanhood.

From the bottom of my heart,
Amber x