Natural Fibre Boardshorts: Do They Exist? (Finally, Yes)

Search for a natural fibre boardshort and you'll find plenty of results. Almost none of them are actually natural fibre.

What "sustainable boardshort" usually means

Type "eco boardshorts" or "sustainable boardshorts" into Google and the results are overwhelmingly recycled polyester, plastic bottles spun into fabric, marketed as a win for the ocean. It's a genuine improvement over virgin plastic. It's also still plastic. A recycled polyester boardshort sheds microplastic fibres in the wash at close to the same rate as a virgin one, sits against your skin the same way, and needed the same water-repellent chemical finish to perform. The story changed. The fibre didn't.

The handful of natural options that do exist

A few brands make hemp and organic cotton shorts with a boardshort-style cut, usually leaning casual and beach-adjacent rather than built for serious time in the water. We reviewed one, Made in Hemp's 100% hemp beach shorts, in our roundup of plastic-free men's shorts. They're a real option if you want something natural on the sand. What's genuinely rare is a natural fibre short engineered for repeated time actually in salt water, built to the same brief as a synthetic boardshort rather than a cotton short that happens to work at the beach.

Why that gap exists

Boardshorts spend their working life wet, then dry, then wet again, in salt water, direct sun, sand and constant movement. Synthetic fibres handle that cycle by default: polyester doesn't absorb water, dries fast, and takes a chemical coating well. Natural fibres don't get any of that for free. You can't take a fabric built for a t-shirt, cut it into a boardshort, and expect it to hold up the same way. Engineering a natural fibre to survive that cycle without falling back on a synthetic blend or a chemical finish is a genuinely harder problem than swapping one material for another, which is exactly why almost nobody has solved it properly, recycled or not.

Yes, they exist. We're building one.

The MARINE|O Natural Boardshort is 100% cotton, a 50/50 blend of pima and long-staple cotton, two of the higher grade cotton types, chosen for a softer hand feel and better durability than a standard cotton short. There's no synthetic coating on it, and the fabric runs at a low GSM, so it dries fast enough for regular use. It won't dry as fast as a synthetic boardshort straight out of the water, and that's a trade-off we're willing to take: no plastic against your skin, no microplastic shedding in the wash, no PFAS coating faking a performance the fibre doesn't need.

Price is locked at $129.99 AUD, below the Merino Wool Walkshort at $169.99 AUD. Timeline is still open, we're not putting a date on it until sampling is finished properly.

FAQs

Do any natural fibre boardshorts actually exist?

A small number of hemp and organic cotton brands make boardshort-style casual shorts. Purpose-built natural fibre boardshorts, engineered for repeated time in salt water the way a synthetic boardshort is, are genuinely rare.

Why are almost all "sustainable" boardshorts made from recycled polyester?

Because it's the easiest fix that doesn't require re-engineering the product. Recycled polyester reduces reliance on virgin plastic, but it's still plastic, still sheds microplastic fibres in the wash, and still needs a chemical finish to perform.

What is the MARINE|O Natural Boardshort made from?

100% cotton, a 50/50 blend of pima and long-staple cotton.

Will it perform like a synthetic boardshort in the water?

Close, but not identical. There's no synthetic coating and the fabric runs at a low GSM, so it dries fast enough for regular use, just not as fast as a synthetic boardshort straight out of the water. That's a trade-off we're willing to make for no plastic against your skin and no microplastic shedding.

How much will it cost, and when does it launch?

$129.99 AUD, locked. No fixed launch date yet, we'd rather take the time to get it right than rush it out.

If you'd like to be the first to hear when it launches, join the waitlist on our boardshorts page →