Performance Fins have a rigid core that creates good drive and projection off bottom turns and cutbacks. The combination of the flexible edges and rigid core will help to make your board ride smoother, faster, and easier to turn. This will allow you to surf better, reduce fin injuries, and add more fun to the sport of surfing!
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Have uses Protgeck for 20 plus years - ever since I discovered them. Had 2 trips to the ER from fin cuts prior to Proteck - none since.