The TSi2 is designed for players seeking incredible speed and accuracy across the entire surface of the face. It features a deeper, lower CG to maximize distance through Speed Optimized MOI design. Accurately tuned for speed at every point of contact, TSi driver faces are constructed from ATI 425 Aerospace Titanium, a unique material that delivers superior strength, elasticity and durability versus the conventional titanium alloys used in golf. The exceptional ductility of ATI 425 allowed engineers to produce Titleist�s fastest driver face, while maintaining the durability properties required for consistent maximum performance. The improved shaping of TSi allows the clubhead to move faster through the air and deliver a more powerful impact. Both TSi2 and TSi3 have been aerodynamically engineered to reduce drag up to 15 percent (versus prior generation TS models), increasing clubhead speed for greater ball speed and distance. The new head shapes feature a tour-requested softer toe profile that looks square at address. TSi feels fast in a golfer's hands and is complemented by meticulous sound engineering that manages vibrations within the clubhead to deliver a Tour-quality sound. While golfers often equate �high MOI� with heel to toe forgiveness, Titleist R&D employs a more holistic approach to MOI design. TSi also optimizes sole to crown performance, producing up to 13 percent higher inertia values (versus prior generation TS models) that deliver more speed and a tighter launch and spin range up and down the face. TSi's speed-optimized MOI works in concert with a low and deep CG position to drive faster ball speed with a high launch, low spin trajectory and exceptional stability for greater distance consistency. Standard Titleist warranty applies and satisfaction is guaranteed. Headcover and wrench included.