Built for a lightweight swing, the Proven (-13) Fastpitch Bat from Louisville Slugger features a full composite barrel design to help young hitters prove their skills at the plate. The one-piece construction offers a stiff swing and solid feel on contact, and the 100% composite barrel boasts a sweet spot engineered for pop. At (-13), Proven is the lightest bat in the Slugger lineup, and the ultra-balanced swing ultra-balanced swing, is built to help you level up your game.