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Women's Underwear

BioFlex™ Ultra Seamless Classic Bikini (Final Sale)

$13.99
$24

Final sale items are not eligible for return, exchange, or online voucher if you change your mind.

By purchasing a final sale item, you agree that the item cannot be returned for a change of mind. We recommend choosing carefully to avoid disappointment and suggest contacting customer care for any assistance prior to purchasing.

Low-rise, moderate-coverage seamless BioFlex™ bikini that stays put all day.

Colour:

Black

Size

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Body: 86% BioFlex™ Nylon (50% Bio-based Nylon, 50% Nylon),14% Spandex. Gusset: 95% RegSilk Protein™ Fibre (88% Modal, 12% Silk), 5% Spandex.

Machine wash in a mesh bag on a gentle cycle below 30ºC, using a mild, enzyme-free detergent. No bleach, fabric softener or tumble drying; air-dry flat.

Pay off your Paire in a few weeks by selecting ‘Afterpay’ at checkout.

We’ll foot the bill on shipping for domestic orders over A$120. Free worldwide shipping over A$200.

Learn More

Take your time. Make sure it feels right.
We want you to feel confident in your Paire. Take the time to try your new piece, check the fit and see how it feels. If it’s not right for you, you have 100 days to return it for a refund or exchange.

Learn More

Any 4 undies or socks for 5% off.
Any 6 undies or socks for 10% off.
Any 10 undies or socks for 15% off.

Discount applies at checkout.
All packs excluded.

Sizing Chart

BioFlex™ Ultra Seamless Classic Bikini (Final Sale)

XS S M L XL 2XL 3XL
AU
6-8
8-10
10-12
12-14
14-16
16-18
18-20
US
0-2
4-6
8-10
10-12
12-14
14-16
16-18
Hips (CM)
85-90
90-95
95-100
100-105
105-110
110-115
115-120
Waist (CM)
60-65
65-70
70-75
75-80
80-85
85-90
90-95

In between sizes? We suggest sizing up.

Second-skin softness

So comfy you’ll forget you’re wearing them

Irritation free

No seams, no tags, no constant readjusting

Easy breezy

Naturally breathable fabric keeps things comfy and breezy

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Product Features

BioFlex™ bends the rules of conventional fabric. Made from 50% recycled corn waste, our bio-based material is created through an innovative process in which starch glucose is extracted from straw and regenerated into a nylon fibre.

The result? A durable fabric that’s lighter than air and soft as butter. Superior breathability and four-way stretch. A skin-hugging fit that’s moves with you.

Undies that ride, roll and bunch up are a thing of the past. Featuring no-slip silicone grippers on the leg-line and moulded grip zones, you can trust these undies to stay put.

VPL who? A seamless construction creates a smooth silhouette, while laser cut edges eliminate lines under clothing.

Thanks to a gusset made with RegSilk™, our material of regenerated silk cocoon protein fibres, these undies keep you fresh all day. Beat odour. Stop bacteria in its tracks.

  • 5 stars: 9 (29%)
  • 4 stars: 1 (3%)
  • 3 stars: 5 (16%)
  • 2 stars: 9 (29%)
  • 1 star: 7 (23%)
J
Joy K.
Disappointed

Why did you change your sizing, have loved your undies for ages, but sadly my last order ride up my bum, has some sort of grip that’s added to leg, that doesn’t work,

K
Kerrie P.
Great buy

I have bought Paire before and have been completely satisfied with everything. The briefs are comfortable, made of lovely soft fabric and fit really well.

P
Paulette
Not as good as the others

I wasn't so impressed with these knickers. The tape around the leg holes started to peel off after the first wear and they have a tendancy to ride up so not at all comfy like the other knickers I have bought from Paire. Its a no from me

K
Kaylene R.

Very comfortable

K
K L.
Trying to return item - no response.

Trying to return my items for an Exchange but have not responded to multiple emails. 100 risk free buy is false advertising

K
K L.
Trying to return item - no response.

Trying to return my items for an Exchange but have not responded to multiple emails. Don’t buy - return guarantee is not true.

C
Carolyn R.
Disappointed

Nowhere near as comfortable as previous purchases and don’t stay ‘in place’

S
Sarah R.
Gusset peeled off after a few wears.

I wore these undies 5-6 times and the gusset has peeled off. These undies weren’t cheap so I expected more. I really love the biotracker undies from Paire and would recco those instead.

S
Sue G.

Love these undies....cool comfortable, quick drying.
Great for travel and everyday

K
Kelly E.
Not as good as previous pairs

I previously bought and have loved my underwear from Paire but this purchase has not been to the same level of quality or comfort. The underwear does not stay in place like previous pairs and unfortunately after two wears the elastic/grip strips are already separating from the pants.
I had recommended to a number of friends from my first purchase but can not on this one.

I
Ivy

BioFlex™ Ultra Seamless Classic Bikini

A
Annie F.

I am so disappointed in these knickers. I am an absolute Paire convert however, having just worn them twice they are really uncomfortable. To be honest I didn’t realise they were different to the ones that I normally purchase.

L
Linda

They are anazing comfortabld and light will definitely buy more nog just fof holidays but for every day

K
K.H.

Love

J
Judi K.
Bio Flex Ultra seamless classic bikini

I ordered these in error as I meant to get the Nude Tech bikini which I absolutely love. I do not feel the bio flex are anywhere near as good as the Nude Tech, they ride up and are uncomfortable and the material is not as soft.

G
Gaby
You can trust that these undies will ride up your bum

"Undies that ride, roll and bunch up are a thing of the past. Featuring no-slip silicone grippers on the leg-line and moulded grip zones, you can trust these undies to stay put."
The description is inaccurate. I spent all day readjusting my undies because of the constant one sided wedgie. The silicone strip is useless. The waist band fits well which means I bought the right size but the leg openings feel like they are too big and poorly designed.
For something good though, the material feels nice!

N
Nadine

Great but should have got the small - medium too big

A
Anna
Most comfy undies ever

Great for traveling and everyday wear, they are my go to with all my outfits.

M
Michelle C.
Shopping mistake

I bought several pairs thinking they were the original type I’d previously ordered (the Bio-trackers). Should have doubled checked, because these are not right. Although the fabric feels nice, they ride up after a couple of wears, as others have indicated. Not helpful at all and I won’t be buying again.

M
Michelle

Great underwear but the elastic delaminated from the fabric near the gusset after a small number of wears

A
Anneliese R.
Disappointing

Accidently ordered the wrong fabric
Really average compared to standard fabric
Falling apart after 3 wears

E
Elina B.
Coming apart and weird size

After one wear the edges are coming unstuck. The waist fit fine but the legs are baggy so the bands to stop them moving don't work because it's too loose. It's such a shame because the biotacker bikini are the comfiest underwear I've ever worn but I wanted ones a dress wouldn't stick too so I was really hoping these would be great.

C
Customer

BioFlex™ Ultra Seamless Classic Bikini

J
Jen D.
Great colour

The pair of skintone Bioflex Ultra Seamless Classic Bikini, which l have worn 6 times, have a thread coming undone on the back waistband. My other pairs of Paire underpants have not had this issue.
Please advice what can be done to resolve this problem.

K
Katharine K.
Super comfortable

Fabric feels soft and silky and really are invisible under my clothes. Highly recommended.

T
Tammy V.
Best fitting Undies

I have been wearing the bikini undies for a few years now aa the fit is excellant they never ride I would recommend to anyone to try them.

S
Sharon S.
Ultra Seamless Classic Bikini

Will not buy these again, I love the other styles and fabric much better.

C
Carrie H.
Rides up like crazy!! (sadly)

3 stars because after a decade of searching, I finally found the perfect material that doesn’t irritate my skin AT ALL. This silk blend is incredible for me since I have a cotton allergy and get painfully itchy. I’m also very sensitive to panties that move an inch, it gives me crazy sensory issues and as soon as I put these on it was like wearing a thong after one minute of walking around my room, so 2 stars taken off. Thankfully, customer service was wonderful and refunded me hassle-free. I wish to order a different style in the silk material, one that doesn’t ride up and has more coverage on the behind.

R
Rachel B.
Not for me

Although the same size as my favourite nudetech undies these just don’t fit me. The silicon grippers also don’t work if you wear body lotion or after they’ve been washed. I’d recommend to size up for these if you’ve not tried this style before

K
Kathy R.

Perfect knickers in every way. Highly recommend all Paire knickers!

J
Jane L.
Lovely soft undies

I loved the feel of these, and the first time I wore them they were fantastic- no riding up, fitted nicely, felt so comfortable, but the second time I wore them they were riding up my butt cheeks all day and were so annoying. What did I do wrong? They went in a cold wash, and I promise my butt didn't change size in a week! Shame as they were expensive.