The Verdict: An all-titanium driver might not sound sexy these days, but Nike makes the case with these two models that combine flexibility in the face with stability in the body. The key improvement from last year’s model is a thinner crown. The saved weight is relocated lower in the head so shots launch with less spin. Helping the entire face flex more on both models is the company’s trademark sole-channel feature. The wall has been thinned to less than a millimeter so mis-hits lose less distance. But all that face flexing is made possible by a more stable back side. External beams and a deep sole cavity allow a better energy transfer to the ball.