Abstract: A method of constructing a multi-layered athletic field includes installing surface and subsurface layers over a foundation. The subsurface layer comprises a backing with a plurality of pile filaments secured thereto and extending upwardly to a desired level. A subsurface particulate fill material resides on the subsurface backing, to surround and support the subsurface pile filaments at the desired level, so that the filaments and the particulate are about the same height. This height, and the composition of the subsurface particulate fill material, are selected to achieve a desired degree of shock absorption for the athletic field. The subsurface particles may be retained, as by a hardened liquid binder sprayed thereon. Thereafter, the surface layer is installed on top of the subsurface layer.

Abstract: A synthetic turf comprises a backing with a plurality of pile filaments secured to the backing and extending upwardly therefrom and filled with particulate fill material. The fill material comprises a lower ballast layer of gravel residing on the backing and an upper layer of resilient particles above the lower layer. The lower layer of gravel provides weight and stability to hold down the synthetic turf without migrating to the surface. The upper layer provides cushioning and uniform resilience for the synthetic turf while the pile filaments create a grass-like appearance for the playing surface.