ThirdLove
The bra company that finally got sizing right with half-cup innovation
The Brand That Proved the Industry Was Wrong About Sizing
ThirdLove launched in 2013 with a deceptively simple premise: what if bra sizes weren't limited to whole numbers? Co-founders Heidi Zak and David Spector used millions of data points from their proprietary Fit Finder quiz to prove what women had always known — that the traditional 36-size system left most people falling between cups. Their answer was half-cup sizes, a seemingly obvious innovation that no legacy brand had bothered to implement.
What Makes ThirdLove Different
The half-cup system is the headline, but the real story is ThirdLove's data-driven approach to fit. Every purchase, return, and quiz response feeds a machine-learning model that continuously refines their size recommendations. The result is an 80-size range that covers AA through I cups, with band sizes from 30 to 48. Their signature memory foam cups — what they call the 24/7 Classic — eliminate the stiff, artificial shape of traditional padding in favor of a contour that warms and molds to your body throughout the day.
Key Product Lines
The 24/7 Classic Collection remains the backbone: t-shirt bras, balconettes, plunge styles, and strapless options all built on the same fit-first engineering. The Pima Cotton Collection targets the comfort-above-all crowd with breathable, tagless basics. For special occasions, their Lace Collection delivers delicate detailing without sacrificing the structural integrity ThirdLove is known for.
Who ThirdLove Is Best For
ThirdLove is ideal for anyone who has never found their "perfect fit" in traditional sizing, particularly women who consistently fall between cup sizes. It's also a strong choice for first-time online bra buyers thanks to the Fit Finder quiz, which reduces the guesswork significantly. If you value comfort and fit over high-fashion aesthetics, this is your brand.
Price Range
Bras range from $68 to $84, with underwear from $16 to $24. They run regular promotions and offer bundle discounts. Relative to department store brands, ThirdLove sits in the accessible premium tier — more than Target, less than La Perla, and arguably better-fitting than both.
Size Range
Bands 30–48, cups AA–I, with half-cup sizes throughout. This is one of the most inclusive size ranges among direct-to-consumer brands. They also carry extended sizes in most core styles rather than relegating them to a separate "plus" collection.
Sustainability
ThirdLove has committed to using recycled materials in packaging and has a bra recycling program called "Bra Recycling" where customers can send back old bras (any brand) to be repurposed rather than landfilled. They've recycled over 500,000 bras to date.