DURAFILL is the latest technology in infill product for synthetic grass. The following are some of the many benefits of Durafill: Animal Urine and other external elements are not absorbed which eliminates building bacterial spores within the infill product. Durafill does not degradate over time and does not need repeated applications. It does not become blistering hot in the heat which would otherwise cause more heat by transfer to the synthetic grass. Durafill is environmentally safe and does not contain silica dust, zinc or heavy metals.