100% Composite Design Patented S1ID Barrel Technology Balanced swing weight New ultra-light weight X-Cap Patented IST 2-piece technology The most popular bat in fastpitch softball has even more reasons to get excited this season. The 2018 Xeno Fastpitch batfrom Louisville Slugger is a two-piece composite bat with a stiff IST connection that now provides even better energy transfer and less sting upon contact. The bat comes hot right out of the wrapper thanks to Louisville Slugger's patented S1ID™ technology with a balanced swing weight, perfect for all player types. The IST Technology two-piece construction has an improved energy transfer you can feel, and the new ultra-lightweight X-Cap™ now gives players even more swing speed and control at the plate.