BioTracker™

A reminder built in

BioTracker™ brings a simple reminder into the underwear itself. The tracker changes colour gradually in response to wear and washing, giving you a quiet prompt for when a pair may be ready to replace. It works without an app or battery, sitting there in the background until you choose to check it.

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Underwear changes with use, even when it still looks fine. This one shows you where it is in that cycle.

The construction underneath

Beneath BioTracker™ is NudeTech™, Paire's seamless underwear construction. Super-fine modal, a regenerated fibre made from tree pulp, feels exceptionally soft and fine against skin, with breathability and a fluid drape. It is knitted seamlessly so no side seams press into the body. The RegSilk Protein™ Fibre gusset blends modal with mulberry silk for added smoothness where it matters most.

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Frequently Asked Questions

BioTracker™ is a colour-changing hygiene tracker built into Paire's seamless underwear. It changes gradually in response to wear and washing, offering a simple visual prompt for when that pair may be ready to replace.

The tracker responds to external stimuli from wear and washing, changing colour gradually over time. It does not measure or detect bacteria, and should be read as a replacement prompt rather than a diagnosis.

Guidance commonly cited is around six months, though wear and care vary from pair to pair. BioTracker™ offers another prompt, with its end point indicating when replacement is recommended.

Sunlight, drying method, hot washes and harsh detergent can all affect the tracker. Direct sun can move the colour faster, while heat and protease enzymes may damage the protein-based components.

No. BioTracker™ works without an app or battery. Check the tracker from time to time and use its gradual colour change as a simple prompt alongside your usual care and replacement habits.

The body uses super-fine modal, a regenerated fibre made from tree pulp, chosen for its exceptionally soft feel, breathability and fluid drape. The RegSilk Protein™ Fibre gusset blends modal with mulberry silk for added smoothness in the panel closest to the body.

BioTracker Mid Brief

$28.00

BioTracker Classic Bikini

$21.00

BioTracker Hi-Cut Brief

$28.00

BioTracker Full Brief

$28.00

BioTracker Boyleg Brief

$28.00

BioTracker G-string

$21.00

BioTracker Men's Boxer Trunk

$28.00

Care Instructions

Turn the underwear inside out and place it in a mesh laundry bag before washing. This helps protect the tracker from rubbing against zips, hooks and other hardware in the load.

Wash on a gentle cycle below 30°C. The body is made with super-fine modal, a regenerated fibre made from tree pulp, while the gusset contains mulberry silk. Cooler water and gentle movement are kinder to both.

Use a mild, enzyme-free detergent. Protease enzymes in biological detergents can break down protein, which is present in both the mulberry silk gusset and the tracker. Skip bleach and fabric softener.

Dry flat in the shade and never tumble dry. Direct sunlight can move the tracker's colour faster than wear alone, while high heat is best avoided for both the tracker and the fabric.

Give each pair time to air between wears rather than folding it away damp. Rotating through your drawer also gives the fabric time to dry fully before its next wear.

Store underwear clean and completely dry, in a breathable drawer or container rather than sealed plastic. Keep it away from direct light to help protect both the fabric and the tracker.

Glance at the tracker from time to time. When it reaches its end point, that pair has reached the stage where replacement is recommended. It is a prompt, not a deadline.