I have been able to test the NAI'A 21 cm yesterday in 20-25 knots of wind and a 5.3 wave sail on my 103 l freemove board and the combination is just perfect better then with the MANO freewave on my board.  The fin holds well and the board keeps its speed and is still very much alive. I went upwind for 5 km with friends on larger sails and fins !

It will be a great fin to put on freeride boards also when the wind is blowing. Advanced Freestylers will prefer the 18 cm on their freestyle board. Its an amazing feeling to sail fins we are conceiving and see how effecient they are. I used to hate weed fins ! Not anymore

http://www.makanifins.com/Windsurfing_Freemove_weed_fins_p/na001.htm