Brown
Brown
Brown
Brown
Brown
Women's Underwear

BioTracker Classic Bikini

$25.99
$29

A classic bikini that sits mid-rise on the hips, made from super-fine modal with Paire’s trademarked NudeTech™. BioTracker™ changes colour gradually with wear and washing, giving a replacement prompt over time. An antibacterial RegSilk Protein™ Fibre gusset keeps it fresh and soft against the skin.

Colour:

Brown

Size

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Body: 88% Super Fine Modal (Tree Fibre), 12% Spandex.
Gusset: 95% RegSilk Protein™ Fibre (85% Super Fine Modal, 10% Mulberry Silk), 5% Spandex.

  • Classic bikini cut that sits mid-rise on the hips
  • Trademarked NudeTech™ for next-to-skin comfort with a barely-there, skin-like feel
  • BioTracker™ hygiene tracker built into the garment, its colour shifting gradually with wear and washing to show when a pair is ready to replace
  • Soft stretch that moves naturally with the body
  • Antibacterial RegSilk™ fibres that help stop bacteria building up
  • Breathable fibres for everyday comfort
  • Hypoallergenic and gentle on sensitive skin

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; dry flat in the shade.

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

Discount applies at checkout.
All packs excluded.

Sizing Chart

BioTracker Classic Bikini

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.

Super-soft tree fibres

Powered by NudeTech™. Feels like a second skin.

Anti-smell & antimicrobial

RegSilk™ fibres stop bacteria from building up.

Never sweaty, always breezy

And sits softly against the skin all day.

/

Product Features

This is not your ordinary pair. Made with fancy things like our sustainable silk. So you can feel things like the perfect amount of stretch, without ever sagging, bending, or snapping.

Our trademarked NudeTech™ gives every pair that special touch. Made from plant-based Modal, it’s what makes them feel like a second skin—like you’re wearing nothing at all.

Made with RegSilk™—our regenerated silk cocoon protein fibres—which has antibacterial and anti-smell properties to keep your most sensitive bits happy and to stop bacteria from building up.

Not sure how old your underwear is?With busy lives and schedules, most of us aren’t keeping tabs on when we last spruced up our drawers. So consider these undies your reminder app — their handy tracker changes colour with wear and time so you can see how long they’ve been in rotation for.Designed with active proteins that sense external stimuli, BioTracker™ lets you decide when it’s time for a refresh.

  • 5 stars: 299 (75%)
  • 4 stars: 57 (14%)
  • 3 stars: 21 (5%)
  • 2 stars: 12 (3%)
  • 1 star: 10 (3%)
Some of the reviews shown are from related products the merchant grouped with this one.
S
Sonja R.
Size (AU): 10-12
Purchased size: M
How it fits: True to size
Comfortable not Durable

These undies are super comfortable, lightweight, quick drying and perfect for travelling. It is a shame though, that after being hand washed 3 times, the elastic waistband has started to fray and I have loose threads constantly tickling me. I purchased 4 pairs and only 1 has this problem so it's more an issue of quality control. For the price, I would expect better.

A
Anna C.
Size (AU): 6-8
Purchased size: S
How it fits: True to size
Classic bikini

Honestly so soft and 💯 comfortable.

S
Sarah G.
Comfiest Undies I’ve ever owned 🙌🏼

These are literally the most comfortable undies I have ever owned!
Obsessed!

C
Customer
Size (AU): 6-8
Purchased size: S
How it fits: True to size

Very comfortable

c
carolyn p.
Size (AU): 6-8
Purchased size: S
How it fits: A bit loose
Comfy undies

Soft comfortable and a great fit.

J
Jill V.
Size (AU): 14-16
Purchased size: L
How it fits: True to size
Bio Tracker

Great undies, so comfy and quick dring making them fab for travel.

A
Ailsa B.
Size (AU): 14-16
Purchased size: M
How it fits: True to size
How good?

Brilliant, great fit and quick dry.

S
Serena P.
Size (AU): 10-12
Purchased size: M
How it fits: True to size
Amazing

These classic bikini are not only wonderfully comfortable but they do not ride up which is amazing. These are my go to undies and I will definitely buy more.

L
Luan L.
Size (AU): 6-8
Purchased size: S
How it fits: True to size
Elastic already fraying

Hello there, I purchased the classic bikinis from paire about a month ago and one of the classic bikinis already have fraying elastic at the top. It has not seen more than 2-3 uses and subsequent washes. They get a cold, gentle wash and there has been nothing to account for threads coming loose and fraying.

J
Janis R.
Size (AU): 10-12
Purchased size: M
How it fits: True to size

Classic Bikini

A
Anne E.
Size (AU): 14-16
Purchased size: M
How it fits: True to size
Comfiest undies

These undies are so comfy! I'm usually a large but ordered the mediums, there's plenty of stretch without cutting off circulation and they don't ride up - another plus!!

J
Jodi F.
Size (AU): 10-12
Purchased size: M
How it fits: True to size
Essential Comfortable Underwear

This is second purchase for BioTrackee Classic Bikini. Tried one pair before buying more. Comfortable and forgiving material on my menopause body. Absolutely love 💕

A
ARLENE

Not lightweight as advertised

A
ARLENE

Not lightweight as advertised

B
Belinda P.
Size (AU): 10-12
Purchased size: L
How it fits: A bit loose
Regretful buy

I purchased for an upcoming Europe holiday. I find the elastic waist and legs uncomfortable. They have a visible line in close fitting trousers, and are no more light weight, or fast drying than other underwear I already own. I would not repurchase.

P
Paula S.
Size (AU): 6-8
Purchased size: S
How it fits: True to size
Too long to dry

Nothing special and very long to dry. Thought I could use for travel

R
Robert G.
Size (AU): 10-12
Purchased size: S
How it fits: A bit loose
Comfiest undies ever

They feel soooo good under clothes

S
Sanet

Very comfortable but too fisible with gym wear

J
Julie U.
Size (AU): 14-16
Purchased size: M
How it fits: True to size
Comfy

This is the second time I have purchased these briefs. Very comfortable. Never ride up. Very soft of your skin

H
Hailey N.
Size (AU): 6-8
Purchased size: S
How it fits: True to size

BioTracker Classic Bikini

H
Heather C.
Size (AU): 10-12
Purchased size: L
How it fits: True to size

Very comfortable. The only ones I wear nowadays

B
Bonnie C.
Size (AU): 14-16
Purchased size: XL
How it fits: True to size

BioTracker Classic Bikini

A
Anna E.
Size (AU): 6-8
Purchased size: S
How it fits: True to size
Comfort

Most comfortable underwear I’ve had in a while. I have an active job and these stay put and don’t show that much under tight clothing. Perfect for me.

P
Pamela D.
Size (AU): 14-16
Purchased size: L
How it fits: True to size
Awesome undies

These are the most comfortable undies I have ever worn. As a person with ASD I am highly sensitive to irritation from clothes but I simply can't even feel these undies when I'm wearing them.

T
Tegan T.
Size (AU): 10-12
Purchased size: M
How it fits: True to size

BioTracker Classic Bikini

L
Lou S.
Size (AU): 14-16
Purchased size: XL
How it fits: True to size

BioTracker Classic Bikini