A hair mat is a flat, felt-like pad made from recycled human hair, animal fur, or wool that absorbs oil and other pollutants. These mats are primarily used to clean up oil spills on water and land, but they also show up in storm drain filtration and even gardening. A standard mat measures about 2 feet by 2 feet, is roughly an inch thick, and weighs around 2 pounds.
How Hair Mats Are Made
Hair mats are produced through a process called needle felting, which tangles loose fibers together into a dense, stable sheet. The raw material is waste hair collected from salons, pet groomers, and farms. It’s sorted to remove any debris like rubber bands, pins, or rocks that could damage the felting machine’s needles, then weighed into precise portions.
Each mat has two outer layers called scrims, made from longer strands of hair, with shorter filler fibers packed between them. The scrims act like a casing that holds everything together. Workers feed the layered fiber through a felting machine, where rows of barbed needles punch up and down rapidly, interlocking the strands. The assembled mat passes through the machine multiple times, then each edge gets an extra pass to create a sturdy border. The nonprofit Matter of Trust, the largest organization producing these mats, reports the felting process takes about 30 minutes per mat once the hair is sorted and prepped.
Why Hair Absorbs Oil So Well
Hair is naturally water-repellent. Its outer layer, the cuticle, is made of overlapping dead cells rich in keratin protein, which makes the surface attract oil while pushing water away. This property is called being hydrophobic (repels water) and oleophilic (attracts oil). The interior of each strand also has a porous structure that traps oil molecules once they make contact.
Human hair can absorb between three and nine times its own weight in oil, depending on the hair type and the kind of oil involved. Curlier, coarser hair types tend to absorb more because they have greater surface area and more texture for oil to cling to. In lab testing, the highest-performing hair type absorbed over nine grams of vegetable oil per gram of hair, and roughly eight grams per gram when exposed to crude oil or diesel fuel. Straighter hair types still absorbed around three to four times their weight.
Oil Spill Cleanup
The idea of using hair for oil spills traces back to a hairstylist named Phil McCrory in Alabama. While watching news coverage of oil-soaked otters during the 1989 Exxon Valdez disaster in Alaska, he noticed how effectively the oily hair he washed at work trapped grease. In 1999, he partnered with Lisa Gautier, founder of the nonprofit Matter of Trust, to develop the concept at scale.
The approach got its first major real-world test in 2007, when the cargo ship Cosco Busan struck the San Francisco Bay Bridge and spilled 58,000 gallons of heavy fuel oil. Within hours, Matter of Trust coordinated hundreds of volunteers to deploy hair booms and mats along Ocean Beach. Three years later, during the BP Deepwater Horizon spill in the Gulf of Mexico, the organization launched a massive mobilization effort. Nineteen warehouses across Florida and Texas received donated hair, fur, and fleece from every zip code in North America and 30 other countries. Thousands of volunteers assembled booms and mats for the Gulf Coast.
Compared to the standard commercial cleanup material, polypropylene (a petroleum-based plastic), hair mats perform surprisingly well. On hard surfaces like pavement or concrete, fur mats and hair products removed over 85% of spilled crude oil, matching polypropylene’s performance. On semi-porous surfaces like gravel, fur mats still achieved over 75% removal, again on par with the synthetic option. The one environment where polypropylene clearly wins is sandy, porous ground, where it averaged 69% oil removal and significantly outperformed all natural sorbents. Hair mats also have an advantage after use: because they contain no synthetic casing, they’re easier to process for reuse or composting than boom-style products wrapped in plastic fabric.
Storm Drain Filtration
Hair mats aren’t limited to emergency spill response. Cities have begun testing them as passive filters for urban runoff. In the summer of 2022, the city of Lahti, Finland, placed hair material around storm drains to capture pollutants washing off roads and parking lots. The structure of hair and wool allows it to trap metals, oil residues, and organic compounds from water as it flows through.
The pollutants targeted in these trials included industrial plasticizers and polycyclic aromatic hydrocarbons (PAHs), which are toxic compounds released from burning fossil fuels. PAHs are considered cancer-causing and accumulate widely in urban environments. Using a renewable, biodegradable waste product to intercept them before they reach waterways is a low-cost alternative to engineered filtration systems.
Use in Gardening and Agriculture
Hair is about 15% nitrogen by weight, making it a surprisingly rich fertilizer. As hair mats or compressed hair cubes break down in soil, they release that nitrogen gradually, feeding plants the same way synthetic ammonia-based fertilizers do. Research published in HortTechnology found that lettuce and wormwood grew about as well with hair-based fertilizer as with chemical alternatives. Plants were able to use roughly 50% of the nitrogen contained in the hair.
The main limitation is timing. Hair decomposes slowly, so it doesn’t release nutrients fast enough for young plants that need an immediate boost. Gardeners using hair mats or hair-based fertilizer typically pair them with a faster-acting nutrient source at planting time, then let the hair provide a steady, slow-release supply over the growing season. The mats also help retain soil moisture by acting as a mulch layer.
Where the Hair Comes From
Most hair used in mats comes from salon floor sweepings, which are otherwise thrown in the trash. Matter of Trust’s donation program accepts hair of any length for mat production, unlike wig-making programs that require 8 to 12 inches. Dyed hair in natural-looking colors is generally fine. Bleached hair and hair dyed unnatural colors are typically excluded from wig programs but can still be used in mats, since oil absorption doesn’t depend on the hair being chemically untreated.
Animal fiber works just as well. Dog fur from groomers, sheep’s wool, and even alpaca fleece all get felted into mats. In comparative testing, recycled dog fur products actually showed a slight advantage over other sorbent types on hard surfaces. The key requirement is simply that the fiber be clean of physical debris before it goes through the felting machine.