What Is Neoprene? The Material Behind Every Wetsuit, and What It Costs

Neoprene is a synthetic rubber, known chemically as polychloroprene, made by polymerising a compound called chloroprene. DuPont invented it in 1931 as a replacement for natural rubber. Foamed into a sponge and laminated with stretchy fabric, it became the material that lets you surf Bells in July.

Almost every wetsuit sold today is made from it. So it is worth understanding what you are actually wearing.

How a wetsuit is built

Pick up any suit and you are holding three materials bonded into one.

The foam core. Polychloroprene whipped full of tiny gas filled cells. Those cells are the insulation. They slow the transfer of heat from your body into the water, which is why a 4mm suit is warmer than a 3mm one and why a compressed, tired suit stops keeping you warm even though it looks fine.

The jersey. A thin layer of nylon or polyester laminated to the inside and outside faces. Raw neoprene foam tears if you look at it wrong. The jersey is what lets you yank a suit over your shoulders on a cold morning without putting a thumb through it.

The seams. Panels are glued edge to edge with a solvent based adhesive, then blindstitched, taped or liquid sealed depending on the price point. Seams are the single most common failure point on any suit, which is not a coincidence. They carry every bit of stress your paddling generates.

Why neoprene won

Nothing has beaten it in ninety years. It insulates, it stretches and returns to shape, it shrugs off saltwater, oils and UV to a degree that few materials manage, and it costs little to produce at volume.

Surfing owes it a real debt. Cold water surf culture did not exist in any meaningful way before wetsuits, and the same goes for winter ocean swimming, spearfishing and most recreational diving.

The part the surf industry does not advertise

Making chloroprene is a heavy industrial chemistry process, and it has a documented human cost.

The US Environmental Protection Agency classifies chloroprene as a likely human carcinogen. Long term exposure has been linked to effects on the lungs, liver, kidneys and immune system. The plant at Reserve, Louisiana, run by DuPont from 1968 and sold to Denka in 2015, sits in a community where air toxicity data has put cancer risk at roughly fifty times the US national average. More than 90 percent of the affected residents are on low incomes and from racial minority backgrounds.

This is not a risk to you as a wearer. Finished neoprene contains very little free chloroprene, and the exposure sits with production workers and people living near the factories. It is a risk that surfing has quietly outsourced, and one that the 2024 documentary The Big Sea put in front of the community for the first time.

What happens when a suit dies

Neoprene does not biodegrade. It was engineered specifically not to break down in water, sunlight or salt, which is exactly what makes it a problem in the ground.

Recycling barely exists, for three reasons:

• The rubber and the jersey are bonded across the whole surface and cannot be separated cheaply
• Polychloroprene is a thermoset, so it cannot be melted and reformed like a plastic bottle
• Collecting bulky suits from thousands of garages costs more than the material is worth

Circular Flow estimates that around 10,500 tonnes of wetsuits reach end of life globally each year, which is more than a million suits. Almost all of it is landfilled, where it will sit for centuries.

What limestone neoprene changes

Very little. Limestone based neoprene and petroleum based neoprene are the same molecule, produced from a different starting material. Patagonia has stated plainly that the two are chemically equivalent and that limestone is not inherently warmer, stretchier or stronger. The limestone route involves quarrying rock and heating it to around 2,000 degrees in an electric furnace, which is not a light touch process.

It is a fair choice if you want to reduce oil dependence. It is not a green wetsuit.

The one thing that genuinely helps

Keep your suit alive longer.

Research from WRAP found that extending the active life of a garment by just nine months cuts its carbon, water and waste footprints by 20 to 30 percent. Wetsuits respond even better than average, because nearly all of their impact is locked in during manufacture. Running a wetsuit costs a rinse and a hanger.

Most suits do not die of old age. They die from one seam split, one blown zip, one fin cut. Fix that one thing and you buy years.

Frequently asked questions

Is neoprene toxic to wear? No. Skin reactions are rare, and finished neoprene holds negligible amounts of free chloroprene. The health concerns relate to manufacturing exposure, not to wearing a wetsuit.

Is neoprene recyclable? Not in any practical sense today. It can be ground into crumb and used as filler for mats and underlay, which is downcycling. A handful of pilot facilities exist in Europe. Australia has none.

How long should a wetsuit last? Five years is the commonly quoted average, and 5 to 7 years is achievable with rinsing, shade drying and prompt repairs. Suits used daily or left in a hot car will fall short of that.

Is limestone neoprene better for the environment? Marginally, and only on the oil dependence measure. The chemistry, the emissions profile and the disposal problem are effectively unchanged.

What is the most sustainable wetsuit? The one you already own. After that, a second hand suit, then a natural rubber suit such as Yulex.