Anti-slip floor coverings; artificial sports surfaces (floor covering); floor covering materials (for existing floors); floor coverings; floor coverings (mats) for use in sporting activities; floor coverings for indoor use; floor coverings having insulating properties; mats for floor covering purposes; sound-absorbent floor coverings; vinyl floor coverings; floating flooring for covering existing floors; floor covering materials (for existing floors); padded coverings for existing floors; tiles (carpet, cork, linoleum, vinyl), being materials for covering existing floors; carpets; squares for use as carpets; underlay for carpets