Thermoregulating Bras, Underwear & Active

Stay the perfect temp in innovative tech.

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See why customers love it.

The tech beneath it all.

Made with the same tech found in men's performance wear, TempSync fibers contain naturally occurring volcanic minerals that help keep body heat, moisture, and odors in check. Wash after wash.

Look hot. Stay cool.

Light, breathable, and free of harmful chemicals, TempSync comes in styles made for every body. Find your favorite.

FAQs

How does TempSync™ technology work?

TempSync™ uses 37.5® Technology — active particles derived from naturally occurring volcanic minerals and permanently embedded into the fiber itself. These particles respond to your body’s heat and humidity in real time, helping you cool down when you’re warm and retain heat when you’re not. Because the technology is built into the fiber — not applied as a chemical finish — the performance doesn’t wash out over time. It works for the life of the product.

What are the benefits of thermoregulating bras and underwear?

Unlike standard breathable bras and breathable underwear that simply allow airflow, thermoregulating bras like TempSync™ actively work with your body to balance temperature before discomfort sets in. The active technology helps pull moisture away from skin, fabrics dry faster, and help keep odors in check longer — which also extends the life of each piece. Whether you’re looking for cooling bras for everyday wear, temperature regulating bras for hot weather, or cooling underwear that moves with you all day, TempSync delivers.

What styles are available in the TempSync™ Collection?

The TempSync™ Collection includes multiple styles for different needs, from wireless cooling bras and underwear to cooling sports bras and leggings for your life on the go. All pieces in the collection are made with the same innovative thermoregulating fabric to keep you at the perfect temperature, so you can stay dry and comfortable, no matter what the day brings.

When should I wear temperature-regulating intimates?

TempSync™ is designed for all-day, everyday wear, not just workouts. Whether you run warm, need cool bras for hot weather, want the best bras for summer, or are looking for temperature regulating underwear that keeps up with your day, TempSync™ has a style for you. For high-intensity activity, explore our TempSync™ cooling activewear.

How do I find the right TempSync™ size for me?

Find the TempSync™ size that’s right for you with our Fitting Room Quiz or take a look at our Bra Size Chart. It takes just minutes and you’ll get online recommendations on the TempSync™ pieces best suited for your body type. Still not sure? A Thirdlove Fit Stylist can help. If your purchase isn’t quite right, exchanges are free for 60 days.

Is TempSync™ good for menopause or hot flashes?

Yes, if you’re looking for cooling bras and underwear, TempSync™ can help combat the hot flashes that can accompany menopause or perimenopause. The 37.5® Technology responds to sudden changes in body heat, helping to regulate temperature during hot flashes and reduce the discomfort of night sweats.

Is TempSync™ underwear free from PFAs, disperse dyes, and PPD?

Yes. TempSync™ fabrics are free from PFAS (perfluoroalkyl and polyfluoroalkyl substances), disperse dyes, and PPD. The thermoregulating technology works entirely through naturally derived mineral particles embedded into the fiber — no chemical finishes applied. So you get all the performance of temperature-regulating intimates without any of the chemicals you don't want next to your skin.

Do you have a certificate or study showing how long the thermoregulation lasts?

The 37.5® Technology used in TempSync™ is scientifically backed. The temperature-regulating particles in 37.5® Technology are embedded directly into the yarn, so they won’t wash out over time. That means the increase in comfort stays consistent for the life of the TempSync product — even after years of use. A scientific peer-reviewed study from the University of Colorado Boulder found that a garment with 37.5 Technology helps actively regulate body temperature over a workout period compared to one without, slowing core temperature rise and extending the average time to max temperature by 28%.