I started an activewear business and now partner with Marvel and Disney. Tariffs are testing our success.

Austin Gayne is the founder of SuperX, a pop culture-inspired gym wear company.

Austin Gayne/SuperX

• Austin Gayne is the founder of SuperX, a superhero and pop culture-inspired gym wear company.
• He works with brands including Marvel to create merchandise based on characters like Spider-Man.
• SuperX bought a lot of materials from China, but pivoted in response to Trump's tariffs.

This as-told-to essay is based on a conversation with Austin Gayne, the 29-year-old CEO of the sportswear company...