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The 4.6″ SUP River and Whitewater Fin for US fin box. Low draft/shallow profile, slide over river rocks and logs or shallow reef and sandbars, more board control. Fin hardware included, no tools required, tighten with your fingers. Hard Nylon Plastic construction is very durable and light. Fits most US Box style fin boxes, compatible with: Longboard/Surfboard/Stand Up Paddle/SUP/airSUP/Inflatable Paddle Board.

Please confirm this fin fits your fin box before purchasing.


  • Fin base length: 7.3″
  • Fin depth: 4.6″