Kumano Ai

Alex Knost Signature 11" Kumano Ai Nylon Fin (for US Box OR Air7 Fin box)

Regular price $38.00

Alex Knost Signature 11" Kumano Ai Nylon Fin For Air7 fin box

Features Kumano System, the screw-less/tool-less fin system for surfboard and paddleboards was developed and patented by the Japanese fin designer/craftsman, K. Kumano.

Our unique Kumano Ai system has gone through intensive field tests and easily allows the users to securely click fins in or out without hassle.

Introducing Kumano Ai

"Kumano Ai" are the small cylinders that hold the fin tight in your board.




 There are two main types of Kumano Ai :

  1. BLUE, Green or Purple Ai for regular surfboards and SUP
    (boards usually made with fiberglass, carbon or epoxy - each fin comes with all 3 of these Ai)

  2. ORANGE Ai ONLY for inflatable SUP (iSUP) and Foam Surfboards and any board using "Air7 brand fin boxes" (each fin comes with 3 of these)


How to use fins with Kumano Ai :​

  1. insert into your fin box.

  2. slide the fin forward

  3. lock down & go !

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WARNING : This ORANGE color Ai should ONLY be used with inflatable surfboards and SUP or Air7 Fin box. If you put this fin into a regular surfboard or SUP you may never get it out!
(never try to install this ORANGE Ai in to a regular hard surfboard or SUP which are usually made with epoxy, fiberglass etc)


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