Callaway Impact Bag...Add Power & Gain Distance! This uniquely designed bag encourages a flat left wrist, develops correct muscle memory and increases upper body strength. For better precision, swing rhythm, endurance and consistency, practice your swing for fifteen minutes daily using the Impact Bag. Callaway Impact Bag Practice Aid features: Water resistant vinyl and overstitched seams for years of use indoors and out Optimum contact points are clearly marked Folds for easy storage and travel Soft design lets you practice anywhere, anytime Develops correct muscle memory for a repeatable swing Encourages a flat left wrist for on-target hits Promotes a square clubface at impact Reduces sky shots, hooks, slices, pulls, pushes, topping, duffing, and shanks Develops upper body strength Increases ball distance Relieves stress Lets you practice anywhere, anytime Callaway Golf...Train Like You Mean It!