Hi @mmleijon, artificial grass comes with several different types of underlayment; this one in particular is about 4" and is pretty soft, so it feels like the real thing! There's a drain underneath, where the tile and grass meet, so it's not visible.

Hi were is this located would it work with a house in seattle

Hi Corinne, this is in San Francisco...I don't see why this wouldn't work in Seattle.