STI Launches Website Showing How STI Fusion Technology is Better FU is short for Fusion, and today STI, the world’s first and only action sports biomechanics research organization, launched the official website for its STI Fusion patent-pending technology that is revolutionizing the way skateboard shoes are made. The brand new site, STIFusion.com, is now live and includes videos, team rider testimonials and detailed information explaining how STI Fusion is stronger, lighter and uses a cleaner production method than traditional vulcanized shoes. stifusion.com/​Cast: Hellaclips