The term 'runway material' is often used to refer to the surface of an airport runway. The most common material used for this purpose is TARMAC, which is a type of asphalt pavement that is composed of a mixture of gravel, sand, and bitumen. TARMAC is a durable material that is able to withstand the wear and tear of aircraft landing and taking off. It is also relatively easy to maintain and repair, making it an ideal choice for airports.