Nylon is the strongest and has the stiffest pile of the different types of artificial grass. It will keep its original shape no matter how much foot traffic it must endure. It can also withstand extremely high temperatures without melting or losing stability. Nylon forms of artificial turf are extremely expensive and are often used for putting or as a secondary thatch improves the strength and stability of more expensive forms of turf. Because of its courser cut and texture, it may look like natural grass but it will not be as soft, nor will it react in the same way as less expensive materials.