Sweatpants are a best-seller for Mack Weldon in normal times. But unsurprisingly, they're especially popular now, as many Americans have seen their commute to the office replaced by yet another day of getting comfortable at home.

"A lot of people are wearing sweatpants, that's for sure," Brian Berger, Mack Weldon CEO and founder, said on the Glossy Podcast.

The activewear brand's focus on e-commerce has also well-positioned it to weather the pandemic. The brand has only one brick-and-mortar store, at Hudson Yards, and no significant partnerships with department stores.

Berger talked about leveraging e-commerce, establishing redundancy in supply lines and being the "cheerleader-in-chief" to his staff.