For the xr 16 driver we worked with the aerodynamics experts at boeing to redefine whatrsquos possible with ball speed we engineered our most forgiving shape ever and boeing made it fast with advanced aerodynamics and a redesigned speed step crown this thing is big and fast like you wouldnrsquot believe with a high speed head and lower drag in the crown that as you can guess is going to add some serious ball speed itrsquos extremely forgiving from the larger shape for more moi a st