Fins are a limiting factor to surfing for anyone who can't afford them.
While surfboards are relatively easy to obtain, fix and even make, fins are not. $100 fin sets are not affordable for most anyone in developing world surf areas. Finmas is not only a new class of surfboard fins, it's also an innovation that can make fins affordable for surfers in these areas.
• Buy a set of 3D printed Finmas fins.
• (Coming soon) Purchase a digital fileset that lets you 3D print your own fins.
3D printers are getting cheap enough that it'd be feasible for someone in these areas to buy a printer and begin making good money, printing fins. For example a decent 3D printer now costs just $230 and an excellent printer is available for $350.