Someone turned up the Heat another notch! Introducing the Blue Heat, the strongest of the mid-priced Heat series. Designed for heavier oil and synthetic lanes, the Blue Heat uses a 1200-grit sanded, light-load version of the potent WOW 2â„¢ particle coverstock to provide traction. Inside is the multi-piece, high flare Heat 2â„¢ core, which combines a high-density egg with a dense flip block to provide more mid-lane reaction and a stronger hook potential in heavier oil.