This article contains content that is written like an advertisement. (March 2018)
ThirdLove is an American lingerie company founded by Heidi Zak and her husband David Spector in 2013. The brand is known for marketing body positivity and offering size-inclusive bras and half-cup sizes. The company produces bras in 78 different sizes. ThirdLove is also known for its online FitFinder quiz, which helps users determine their best fit bra and style.
ThirdLove was inspired by Zak's own challenges with bra shopping, when she could not find bras that were both beautiful and comfortable. In 2013, she and Spector left their Google advertising jobs to take a data-driven approach to designing bras. After using Craigslist to invite 100 women to photograph themselves wearing fitted tank tops over their bras, ThirdLove used the images to design both their prototype bra with the help of proprietary mold designer Ra'el Cohen and an app that would determine bra size. Upon finding that standard cup sizes do not fit 37% of women, ThirdLove created half-cup sizes.
ThirdLove launched its first line in spring 2014. Initially, the company nearly collapsed when manufacturing in Mexico, due to the high cost of importing fabrics, and lost $400,000 in investment capital when it transitioned to manufacturing in China. To generate more interest in the bras, the company streamlined its app and implemented its try-before-you-buy program in March 2015.
As of late 2016, the company shipped approximately 50,000 bras a month.
In 2019, ThirdLove opened its first pop-up shop in Manhattan's Soho neighborhood from July 24 through the year's end.
ThirdLove raised $5.6 million in its seed round in 2013. Investors included NEA, Andreessen Horowitz, Yuri Milner, Silas Chou, Barry Sternlicht, Munjal Shah, Nasir Jones (NAS), and XG Ventures. The Series A investment was $8 million in 2016 and investors included Pegasus Tech Ventures, New Enterprise Associates and Lori Greely (former CEO of ThirdLove's competitor, Victoria's Secret). In 2019, the Series B funding was $55 million and included investments from Katie Couric, Anne Wojcicki, Susan Wojcicki, and L Catterton. 
Victoria's Secret controversy
In a November 8, 2018 interview with Vogue, Ed Razek, former CMO of Victoria's Secret's parent company L Brands, expressed no desire to cast plus-size and “transsexual” models in the Victoria's Secret Fashion Show "because the show is a fantasy". Razek also claimed that the brand is "nobody’s third love" and that "Victoria's Secret has been women's first love from the beginning".
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