F4 is about passion – for the sport, speed, racing and quality. Creating the fastest, most stable and versatile foils on the market requires skill, constant R&D and countless hours of testing. Hydrofoils uniquely require the combination of 3D design, fluid dynamics, composites, and processes. 

We have been fortunate to be able to work and innovate with some of the best riders and companies in the industry and drive the evolution of foiling across windsurfing, surfing, winging, and kitesurfing.  

Based in Silicon Valley we followed in the footsteps of some of the most innovative and successful startups. We began with building prototypes in our garages, and over the course of the following few years we have won PWA races, speed records, and delivered countless hours of excitement and enjoyment for our customers. 

We use cutting edge technology, manufacturing and the valuable feedback from our team riders and partners to deliver race proven premium products to our end users in all of the markets we serve.