Artificial turf is a manufactured surface designed to look and function like natural grass. It consists of synthetic fibers (the “blades”) attached to a fabric backing, with granular material packed between the fibers to keep them upright and cushion impacts. Originally developed in the 1960s for indoor stadiums, it’s now used on sports fields, playgrounds, lawns, and commercial landscapes. The technology has gone through three major generations, and today’s versions are far more sophisticated than the carpet-like surfaces of decades past.
What It’s Made Of
A modern artificial turf system has several layers stacked together. At the bottom sits a compacted base of crushed stone or gravel, which provides drainage and a stable foundation. On top of that is often a shock-absorbing pad, sometimes made of foam or rubber. The turf itself is a fabric backing with thousands of synthetic fibers stitched or glued into it, standing upright to mimic blades of grass.
The fibers are typically made of polyethylene, though nylon and polypropylene are also used. Polyethylene is the most common because it feels softer underfoot and holds up well to wear. Fiber heights on sports fields usually range from about 40 to 70 millimeters, and they come in two styles: monofilament (individual round or oval strands) and slit film (flat ribbons that split apart over time to create a fuller look).
The material packed between the fibers is called infill, and it plays a critical role. Current third-generation systems typically use crumb rubber, silica sand, or a blend of both. Crumb rubber is usually made from recycled vehicle tires that are ground or frozen and shattered into granules about 2 to 3 millimeters across. Some newer fields use organic alternatives like cork, coconut husk fibers, or ground walnut shells, though these make up a small share of the market. Organic infills avoid the chemical concerns of rubber, but they can compact and harden without consistent maintenance, and they tend to decompose over time.
How Hot It Gets
Heat is one of the most noticeable differences between synthetic and natural surfaces. Research from the University of Kansas measured surface temperatures on both types of fields during hot weather and found that artificial turf averaged about 95°F compared to 75°F for natural grass. On the hottest days, turf surfaces reached as high as 136°F, while grass topped out around 91°F. Even the air temperature measured at about four feet above the surface was slightly but measurably higher over turf.
This matters for anyone exercising on synthetic fields in warm weather. The surface heat radiates upward, raising the temperature athletes actually experience. Dark-colored rubber infill absorbs and retains solar energy efficiently, which is why some newer installations use lighter-colored or organic infill materials in an attempt to reduce heat buildup.
Chemical and Environmental Concerns
Crumb rubber infill contains a range of chemical contaminants, including volatile organic compounds, semi-volatile organic compounds, and metals. Lab studies have found relatively high concentrations of aluminum, zinc, and iron in rubber crumb samples. As the granules break down through weathering and use, these substances can leach into surrounding soil and water or release into the air above the field.
A separate concern involves PFAS, sometimes called “forever chemicals,” which have been used as processing aids in manufacturing artificial turf fibers. People playing on fields containing PFAS can be exposed through skin contact, breathing, or accidentally swallowing small particles. California’s Department of Toxic Substances Control has been investigating this issue and reported that turf manufacturers committed to removing PFAS-based ingredients from their products by 2025. State regulators are currently testing products to verify whether that shift actually happened, and they’ve indicated they’ll pursue regulation if PFAS continues to show up.
Plastic pollution is another dimension. The synthetic fibers themselves shed into the environment over time. One study tracking waterways near turf installations found up to 20,000 artificial turf fibers flowing through a river per day, with fibers also accumulating on nearby sea surfaces at densities of over 213,000 per square kilometer. These fibers, composed mainly of polyethylene and polypropylene, accounted for up to 15% of the larger plastic debris found in the water. Rainfall significantly increased the amount of fiber runoff.
Injury Risks Compared to Natural Grass
The injury question is one of the biggest debates in sports. A systematic review of the research found that foot and ankle injuries occur at higher rates on artificial turf than on natural grass, and this holds true for both older and newer turf generations. The most likely explanation involves the surface’s grip: synthetic fibers and rubber infill can “grab” a shoe’s cleats more firmly than soil and grass, increasing rotational forces on the foot and ankle during quick cuts and pivots.
For knee and hip injuries, the picture is more nuanced. Rates were generally similar between surfaces for soccer players on modern turf. But football players competing at elite levels showed a higher rate of knee injuries on artificial turf compared to grass. This may reflect the combination of higher-speed collisions and the surface’s less forgiving response to sudden stops.
Bacteria on Synthetic Surfaces
Natural soil has microbial competition that helps break down harmful bacteria relatively quickly. Synthetic turf doesn’t have that ecosystem. Research on MRSA, a drug-resistant staph infection of particular concern in contact sports, found that the bacteria survived on rubber infill for up to 96 hours, with half the bacteria still viable at around 13 hours. On the turf fibers themselves, MRSA lasted up to 24 hours, with a half-life of about 4 hours. Sand-based infill was the worst performer, keeping bacteria viable with a half-life of nearly 28 hours.
This doesn’t mean synthetic fields are inherently dangerous, but it does mean that players with open cuts or abrasions face a real transmission window, especially on heavily used fields that aren’t regularly cleaned.
Why People Choose It Anyway
Despite the concerns, artificial turf solves real problems. A natural grass field used for heavy sports play needs rest periods to recover, regular mowing, irrigation, fertilization, and reseeding. In northern climates, grass fields can become unplayable mud pits by mid-fall. Synthetic turf handles virtually unlimited play hours, drains quickly after rain, and requires no water or mowing. For schools and municipalities with limited budgets and high demand for field time, these practical advantages often tip the decision.
Installation costs are significantly higher upfront, typically several hundred thousand dollars for a full-size field. But proponents argue the math works out over the turf’s 8- to 12-year lifespan when you factor in eliminated maintenance costs. End-of-life disposal remains a challenge, though. Old turf fields generate large volumes of plastic and rubber waste, and recycling infrastructure is still limited. Some worn-out fields end up in landfills, which has prompted growing interest in designing turf systems with recyclability built in from the start.