GRS DrainPanels are the durable tile system for a permeable artificial grass underlayment. GRS DrainPanels have a unique checkerboard pattern that ensures optimal load distribution and a stable surface. In addition, special spikes are attached to the top of the tile system, preventing the artificial grass from shifting. To connect the slabs together, special connectors have been developed so that the tiles stay firmly together. Also, this patented connection system ensures, that the panels can shrink and expand among themselves with varying temperatures. The GRS DrainPanels thus form the basis for an ecologically responsible paving under artificial grass.