The STI Fusion process creates an unbreakable bond by fusing the shoe's upper, midsole and outsole together - making it significantly more durable. Specifically, the liquid PU locks into the strobel board creating the unbreakable bond between the upper and the outsole.
STI Fusion shoes weight less because they use less rubber and glue than traditional vulcanized rubber shoes. All vulcanized shoes have a big rubber lip along the edge of the outsole to ensure there is a good bond between the outsole and the foxing tape. STI Fusion doesn't require this rubber lip or extra foxing tape, which make sthe shoes up to 20% lighter.
The production time of the STI Fusion process is reduced by 75 percent and requires less glue and energy* to produce the shoes - making a tremendous impact toward a cleaner production method.
* Further information can be found on the STI Fusion website.
