8 October 2026International edition
Vol. I · No.
8 October 2026
AI in Fashion
DAILY
The daily briefing on AI in the fashion business
Where fashion meets artificial intelligence.
Lingerie, swimwear and hosiery

ThirdLove

United States

ThirdLove is a San Francisco-based online intimates brand founded in 2013 by Heidi Zak and David Spector. It is known for bras in a wide range of sizes, including half-cup sizes, sold mainly through its own website.

Facts
Founded2013
FoundersHeidi Zak, David Spector
HeadquartersSan Francisco, United States
SegmentLingerie, swimwear and hosiery
SizesA to H cups, half sizes
Websitethirdlove.com
Segment
Mid-market
Categories
WomenswearLingerie
Sales channels
E-commerce

What is ThirdLove?

ThirdLove sells bras and underwear online. Wikipedia states that it was founded in 2013 by Heidi Zak and David Spector and is based in San Francisco. Wikipedia does not name a current owner, and none is stated on the brand's site, so this profile does not name one.

Products and positioning

The brand describes its offer as bras and underwear for every body. Its site lists T-shirt, wireless, push-up, plunge, strapless, minimiser, unlined and full-coverage bras, smoothing styles, no-show underwear and nipple covers. Bras are shown at between 68 and 78 US dollars. Sizing runs from A to H cups with half-cup sizes, and the homepage refers to sizes from AA to H. A Find My Fit quiz helps customers choose a size. As of 2022, Wikipedia notes that sportswear and sleepwear were also offered.

Business model and distribution

ThirdLove is primarily an online business. Its storefront does not mention wholesale partners, and a loyalty programme offers rewards and free shipping above a spending threshold. Wikipedia notes a pop-up shop in SoHo, Manhattan, between 2019 and 2020, and says the brand serves customers worldwide, mainly online.

  • Founders: Heidi Zak and David Spector
  • Sizing: A to H cups including half sizes
  • Channel: mainly direct to consumer

Why it matters

ThirdLove is one of the best known digitally native bra brands. Its emphasis on size range and fit tools makes it a useful reference for how online intimates retailers address the high return risk in bra sales.

Frequently asked questions

Who founded ThirdLove?

ThirdLove was founded in 2013 by Heidi Zak and David Spector. It is based in San Francisco.

Where can you buy ThirdLove?

ThirdLove sells mainly through its own website. It also ran a pop-up shop in SoHo, Manhattan, from 2019 to 2020.

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