Board shorts and swim trunks are the same thing with different inseams.

Yes, there is a difference, but it’s mostly about length and style—not some deep technical distinction.

Board shorts are longer, typically hitting just above the knee or mid-thigh. They’re designed for surfing: the extra length stops them from riding up when you paddle, and the lace-up fly is flat so it doesn’t dig into a rash guard. They usually don’t have built-in mesh—surfers wear boardshorts over a wetsuit or with a separate liner.

Swim trunks are shorter—often mid-thigh or higher—and usually come with built-in mesh lining. They’re the classic “gym class shorts” cut. Less fabric, more movement, but they can ride up in the water.

Fabric is basically the same these days: quick-dry polyester or nylon. Some board shorts have drainage mesh pockets and a velcro-closed pocket for keys. That’s about it.

Pick the cut you’d actually wear. If you surf or hate shorts that show thigh, get board shorts. If you just want to w