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Surfboard Fins – FCS & Futures Compatible Surf Fin Sets

Find the perfect surfboard fin set for your board and riding style. Eisbach Riders surf fins are designed for thruster, quad, and rapid surfing setups, compatible with the most popular fin systems including FCS and Futures.

Whether you're looking for responsive thruster fins for performance surfing, quad fins for speed and drive, or durable fins for river surfing, our collection offers reliable control, speed, and stability.

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US-Box Fins

The US-Box is the most widely used fin system on inflatable and hardboard SUPs — a reliable, deep-set single-fin connection suited to everything from flatwater touring to river runs. Eisbach Riders US-Box fins are engineered and finished in Germany from eco-friendly materials, available in Touring and River Touring profiles to match the handling demands of each paddling style.

The Touring fin is shaped for maximum glide and tracking efficiency on open water. The River Touring fin is cut shorter and built with more flex — designed for the directional changes and underwater obstacles of river paddling, with a breakaway flex tip for safety in rocky or shallow water.