Yulex vs. Neoprene: Which Wetsuit Material Is Better?

Paddle out at any beach and almost every board rider is wearing the same thing: a black suit of neoprene, the foam rubber that has kept surfers warm since the 1950s. Lately a quieter option has been showing up in the lineup, sold as plant-based, petroleum-free, neoprene-free. Patagonia makes one. So do dozens of smaller labels.

The words sound interchangeable. They aren't. Here's what a Yulex wetsuit, a limestone neoprene wetsuit and a regular neoprene wetsuit are actually made of, and what touches your skin in each one.

Neoprene, the default

Neoprene is the trade name for polychloroprene, a synthetic rubber. It's built from a smaller chemical called chloroprene, which is usually made from oil. Whip it full of tiny gas bubbles and you get a foam that traps a thin layer of warm water against your body. That's the whole trick of a wetsuit.

The health story starts at the factory. In 2010 the EPA concluded that chloroprene is likely to be carcinogenic to humans when breathed in, and California has listed it as a carcinogen under Prop 65 since 2000. For years the only neoprene plant in the United States sat in LaPlace, Louisiana. The Justice Department sued its owner, Denka, in 2023 over chloroprene in the air around a neighborhood and an elementary school. The suit was dropped in March 2025, and Denka halted production that May.

That risk belongs to the people who breathe the air near the plant. A finished wetsuit isn't giving off chloroprene in the water. What sits on your skin is a different question, and we'll come back to it.

Limestone neoprene, the same rubber

Many premium brands now use limestone neoprene. Instead of starting with oil, it starts with limestone, turned into a chemical called acetylene and then into chloroprene.

So limestone neoprene really does skip the oil. But the finished rubber is the same polychloroprene as any other neoprene. It's a different starting point for the same material. A 2023 materials review from the University of Exeter puts it plainly: limestone neoprene is still chloroprene, and the claims about its warmth and weight still need independent testing.

Yulex, the one that grows

Yulex is natural rubber, the same milky sap tapped from Hevea rubber trees for more than a century. The company started in Arizona in 2000 working with guayule, a desert shrub, and later moved to Hevea to keep up with demand from Patagonia, its partner since 2008. Patagonia shared the recipe with the rest of the industry in 2014. Yulex says more than 50 brands now use it.

Two things set it apart from ordinary latex.

The first is where it grows. Patagonia's Yulex comes from plantations certified by the FSC (Forest Stewardship Council), and the brand says the trees aren't planted on newly cleared rainforest. Rubber is a real deforestation crop, which is why the EU is adding it to its anti-deforestation rules.

The second is a cleaning step Yulex calls YULEX PURE, a water-based process that removes most of the proteins in natural latex. Those proteins cause latex allergy. Yulex says it strips out 90 to 99% of them, and it tests to ASTM methods. Nobody has verified that independently yet.

One honest footnote. A Yulex wetsuit is usually 85% natural rubber and 15% synthetic rubber by polymer content. The synthetic part helps it stand up to sun and stretch, and no brand we found names what it is.

What actually touches your skin

Here's what the foam debate leaves out. A wetsuit is a sandwich. Fabric on the outside, foam in the middle, fabric on the inside, all glued together. The layer against your skin is the lining.

On most suits that lining is recycled polyester or nylon, plastic thread spun from old bottles. That's true of Patagonia's Yulex suits and of almost every natural rubber suit we looked at. Some keep a strip of neoprene at the neck for the seal. Recycled plastic is still plastic, and it's still against your skin for the whole session.

Then there's the curing. Raw rubber is sticky and weak until it's vulcanized, cooked with chemicals called accelerators that link it into a springy solid. Neoprene usually uses thioureas. Natural rubber uses its own set, called thiurams, carbamates and MBT. Dermatologists at DermNet list all of them as known causes of allergic contact dermatitis, an itchy, delayed rash where the material touched you.

It's on record in wetsuits. In 2018 the Journal of Dermatology published the case of a man with a rash traced to diethylthiourea in his neoprene suit. Cases like this are uncommon. But the cause is the curing chemicals, not the oil, so a plant-based suit doesn't rule it out. Yulex says so itself: it doesn't call its rubber hypoallergenic.

Europe pays closer attention than the US. EU law caps cancer-linked PAHs (a family of chemicals from fuels and soot) at 1 mg per kg in rubber that touches skin, and it lists ETU, an old neoprene accelerator, as a substance of very high concern because it can harm fertility. The US has no limit on what's in a wetsuit at all.

Which is better?

For the planet, natural rubber has the edge. Yulex reports about 0.7 kg of carbon per kg of its raw rubber, against about 6.5 for neoprene. Those are the company's own numbers, for the raw material only, not a finished suit. No independent study has compared whole wetsuits yet.

For warmth, the gap has closed. The Inertia tested a Patagonia Yulex suit in 8°C water and called it just as warm as neoprene, if not warmer. Early Yulex suits ran stiff. Newer ones stretch more.

For your skin, it's closer than the marketing suggests. Yulex removes one known trigger, the oil-based foam and its thiourea curing, and keeps the plastic lining. If your skin is calm in neoprene, a Yulex suit is the cleaner choice for the world without being a cure-all. If you've ever broken out in a suit, the rubber family matters less than the curing chemicals, and a dermatologist can patch test for them.

What to look for

Read the foam line first. Yulex or FSC natural rubber is the plant-based option. Limestone, Geoprene and eco neoprene all mean neoprene.

Check the details too: whether there's neoprene at the neck or in panels, whether the glue is water-based, and what the lining is made of. Rinse your suit in fresh water and dry it in the shade, since sun breaks down rubber faster.

And when it's worn out, don't bin it. Patagonia takes back Yulex suits and recovers the materials. Neither kind of suit breaks down in a landfill.

The clothes you swim in count the same as the clothes you sleep in, and the label on a wetsuit is worth reading just as closely. Browse the guide to Yulex, or see the wetsuits we'd buy.