The classic is still the polyurethane (PU) foam core with a fiberglass wrap—it’s the soulful, responsive feel most of us know. Epoxy boards are lighter, more buoyant, and durable, great for certain designs. Then you’ve got eco-options like recycled blanks and bio-resins for the environmentally conscious charger. Each material has a distinct flex and weight. It’s not about better or worse, but about what feel you connect with under your feet on a pumping day.