It is important to understand that there is no consensus among OLA users in Toronto as to which surface material is best. While mulch is preferred by some, it is very much not preferred by others. A number of factors are considered in selecting the appropriate surface material for an OLA, including dog comfort, safety, accessibility, durability, ease of maintenance, aesthetics, size of the facility and concentrated use. The use of artificial turf in OLAs is an emerging best practice that is being implemented in other OLAs across the city. In the example of Underpass Park West, artificial turf provides the best user enjoyment, and greatest durability, and is the most cost-effective in terms of maintenance.