- Mid-top design for added support
- STI Fusion™ technology
- 400 NBS rubber outsole
Unlike vulc shoes which use glue to hold the different parts of the shoe together, the upper and outsole in STI Fusion shoes are held together using liquid PU foam. As the PU dries it creates an unbreakable bond. By adding a piece of foxing tape; a vulcanized look is achieved.
Not only is STI Fusion more durable and comfortable, it is also twice as flexible and 20% lighter than previous generations of vulc shoes.