sentences:  Although rare, the injury to Kieswetter was followed by another high-profile case, when Phillip Hughes died after being struck on the head by a cricket ball while batting.These incidents led the ECB to make the wearing of helmets mandatory for professional cricketers in England from the start of the 2016 season, and banned them from wearing helmets with adjustable grilles, specifying that the gap between the grille and the cap should be no more than .Kieswetter's confident and attacking batting style was compared to that of Kevin Pietersen, another England batsman of South African origin.