The Nokian WR D3 has a directional tread pattern with new solutions to actively prevent slush planing."We further enhanced the tyre's resistance against aquaplaning and slush planing by applying a slanting, staggered front edge of tread blocks. This new innovation is called Slush Blower, because it actually blows water and slush away from the tyre (in Swedish:däck) grooves. For more information visit this site : http://www.nokiantyres.se/