Artificial grass mats known up to now consist of artificial blades of grass, made of plastics like for instance polypropylene, polyethylene and teflon, which are provided on a support layer. Said fields are widely used to play ball sports like soccer and hockey but have a well-known disadvantage. When someone falls down on the artificial grass and especially upon making a sliding-tackle on it high temperatures are locally developed which may cause nasty wounds. Generally, one