The HD on the Stealth HD model stands for "high-draw". This is the highest launching model of the stealth driver line, and also has slight offset that provides a bias towards a draw ball flight. This HD model will be a good fit for people that tend to fade or slice the ball regularly. Someone who wants to move the ball right to left would fit well into this driver. In short, the HD stands for "high-draw" in the Taylormade Stealth HD driver. , The Taylormade Stealth HD driver is designed to help fix a slice. The HD stands for Draw biased which helps avoid the right side of the course. It is amazingly forgiving and is super easy to hit. Not good for someone who hits a draw but perfect for anyone whose miss is a fade or a push. , Most major golf companies will release multiple different models of Drivers under the same name. For example, the new TaylorMade Stealth Drivers come in the Stealth, Stealth HD and Stealth Plus. The HD here stands for "High Draw". This means that the club is a little more offset so that the club can bias the ball in a draw direction to offset most beginners' misses which is a slice.