Mack Weldon

Mack Weldon is a New York direct-to-consumer menswear label founded by Brian Berger in 2012 to rework men's basics with performance fabrics and simplified sizing. The line centers on boxer briefs, trunks, undershirts, socks and t-shirts, and has widened into sweats, polos, swimwear, activewear and accessories in muted solid colors. It sells mainly through its own site, using loyalty rewards and a try-on guarantee to drive repeat orders. Private equity firm North Castle Partners has held a majority stake since 2019.