Surf Glossary - Q: Quad
Quad is a fin set up with four fins. This set up is built for speed. You seeting you hybrid shape for a day with small fun waves? A quad fin set up will help you to generate speed out of every pump! You're going to hunt barrels on your pin tail? The quad set up will give you maximum rail control.
Only thing a thruster (3 fins) is better is on long walls for maneuvers.