The artificial grass underlay is recommended for use underneath the grass installation on existing hard landscaped areas (i.e. over tarmac) to provide a cushioned base and vertical drainage.
One of the benefits of this underlay is the protection it provides. Not only is it good for standard artificial grass installations, but is more than ideal for installations on patios. Another area it would be highly beneficial on are play areas, where trips and falls are more likely to happen. Padded underlay for artificial grass installations is becoming increasingly popular because of their shock absorbing properties. Not only will it provide additional safety, but also prevents the grass from flattening after everyday use.