Mack Weldon was founded in 2012 in New York City by Brian Berger and Michael Isaacman, who aimed to reinvent essential menswear items using innovative fabrics and streamlined ecommerce instead of traditional retail channels. Berger was initially frustrated by the frequently poor shopping experience and low-quality products commonly found when purchasing essential men’s garments like underwear and socks.

Mack Weldon launched their flagship 18-Hour Jersey underwear, which featured an intelligently designed microfiber fabric offering extended comfort. The launch product became an instant success amongst male consumers. Positive word of mouth and smart digital marketing accelerated Mack Weldon’s early growth trajectory. By 2015, just three years after its founding, Mack Weldon had generated over $10 million in annual revenue solely from the popularity of its underwear line. Buoyed by this success, the company began designing t-shirts, socks, activewear, and other men’s wardrobe essentials.

As of 2023, Mack Weldon sells a full spectrum line of spanning underwear, t-shirts, jackets, and swimwear across their ecommerce site and through select retail partners. Annual sales now exceed $100 million, cementing Mack Weldon’s market status as an innovative leader in direct-to-consumer menswear. With over 100 employees, the New York-based company leverages technical fabric innovations and straightforward digital shopping experiences to reinvent foundational garments in the average man’s wardrobe.