Most modern running tracks are made of synthetic rubber and polyurethane, layered over an asphalt or concrete base. The familiar red or reddish-brown surface you see at schools, universities, and Olympic venues is a carefully engineered system designed to absorb impact, return energy, and hold up under years of foot traffic and weather. But not all tracks use the same materials or construction methods, and older tracks were built from very different stuff.
The Layers of a Modern Synthetic Track
A synthetic running track isn’t a single slab of material. It’s built in layers, each with a specific job, typically totaling 13 to 15 millimeters thick on top of the base.
The foundation is usually compacted asphalt or concrete, graded for drainage. On top of that sits a seal layer that prevents moisture from creeping up into the running surface. The bulk of the track comes next: a base layer roughly 10 millimeters thick made from black SBR (styrene-butadiene rubber) granules bound together with polyurethane resin. These granules are often made from recycled tires, giving them a second life as shock-absorbing material. Finally, a top coat of 3 to 4 millimeters is poured or sprayed on, embedded with colored EPDM (ethylene propylene diene monomer) rubber granules. Those granules are what give the track its signature color and grip.
The polyurethane acts as the glue holding everything together. It’s a two-part chemical system: a colored paste mixed with a binding agent and a small amount of catalyst. When these components cure, they form a flexible, weather-resistant surface. White lane lines are painted on using a separate polyurethane marking compound.
Prefabricated Rubber Tracks
Not all tracks are poured on-site. Some of the highest-performance surfaces, including those used at the Olympics, are prefabricated in factories. Mondo, the Italian manufacturer that has supplied surfaces for multiple Olympic Games, produces tracks from vulcanized rubber made under tightly controlled factory conditions. The rubber sheets are manufactured, tested for consistency, and then shipped as rolls to be glued down at the venue.
The advantage of prefabrication is uniformity. Every square meter responds identically underfoot, regardless of the weather during installation. A poured-in-place track can develop slight inconsistencies depending on temperature, humidity, and the skill of the installation crew. Prefabricated tracks eliminate those variables. That uniformity matters for performance and injury prevention: the more irregular a surface is, the more a runner’s legs have to compensate, which increases strain on muscles and joints.
What Older Tracks Were Made Of
Before synthetic surfaces took over in the late 1960s, most tracks were built from natural materials. Cinder tracks, the dominant surface for much of the 20th century, were made from a mixture of ash,iteite carbon (often from burned coal or wood), and crushed rock or clay. The name “cinder” comes directly from the coal cinders used in the mix. These surfaces were loose, slow, and notoriously weather-dependent. A heavy rain could turn a cinder track into mud, and dry conditions made it dusty and abrasive.
Some older facilities still use clay or compacted dirt tracks for training purposes, but they’ve essentially disappeared from competitive athletics. The transition to synthetic surfaces began after the 1968 Olympics in Mexico City, where a polyurethane track was used for the first time at that level. The term “tartan track” became a common nickname for synthetic surfaces, borrowed from the brand name of that early product.
What the Rules Require
World Athletics, the governing body for track and field, sets strict standards for competition surfaces. A certified track must absorb between 35% and 50% of the force of impact at surface temperatures ranging from 10°C to 40°C. That range is carefully chosen: too little cushion and the surface punishes joints, too much and it feels sluggish and robs runners of energy return.
Thickness must stay consistent across the entire surface. No more than 10% of the total area can fall more than 10% below the certified thickness, and any spot where the surface drops below 80% of its intended thickness is flagged as exceptionally thin and must be repaired. These standards ensure that a runner in lane 8 gets the same biomechanical response as a runner in lane 1.
Safety of Recycled Rubber
Because many tracks use granules made from recycled tires, questions about chemical exposure have come up repeatedly. A multi-agency federal study led by the EPA and CDC examined what chemicals are present in recycled tire crumb and whether they pose a health risk. The researchers found that tire crumb does contain a range of metals and organic compounds, as expected. However, only small amounts of most chemicals are released into the air during active use, and for many of those chemicals, concentrations at outdoor fields were no different from background levels.
When it came to metals, less than 1% to 3% were released into simulated biological fluids, compared to a worst-case assumption of 100%. Blood tests of people who regularly used synthetic surfaces showed metal levels similar to the general population, and urine tests showed no difference in certain chemical markers between people using synthetic turf and those using grass fields. The findings were broadly reassuring, though research in this area continues to evolve.
Lifespan and Cost
A well-built synthetic track with a sealed polyurethane surface can last 20 to 30 years before the base structure needs replacing. The top surface, however, wears faster. Most outdoor tracks need resurfacing every 8 to 15 years, depending on usage, climate, and maintenance.
Building a new track from scratch is a significant investment. A standard 8-lane track costs roughly $492,000 to $1,180,000, depending on the surface material, soil conditions, and location. Resurfacing the same track runs $298,000 to $946,000. Smaller facilities pay less: a 4-lane track costs $240,000 to $665,000 to build, while a compact training track (about 10,400 square feet) can be built for $108,000 to $304,000.
The cost difference between a basic polyurethane surface and a premium prefabricated rubber system can be substantial. But even at the lower end, synthetic tracks are far more expensive than the cinder and asphalt surfaces they replaced. The tradeoff is durability, consistency, and a surface that performs the same in rain or heat, year after year.