DST stands for Delayed Strike Technology. DST golf clubs force you to locate, train and perfect the optimal impact position. Impact is the moment of truth in the swing, it is the only position that really matters. The secret of golf is to have a delayed strike or lag impact where your hands lead the clubface through impact.
When your hands lead the club face through impact you maintain control over the clubface until after the ball has been struck and compress the ball at impact. Controlling the clubface through impact means you control the distance and accuracy of your ball.