5 Colors Available.
Foot sizes; 36-37, 38-39, 40-41, 42-44, 44-46. 
Stiffness: X-Soft, Soft, Medium, Hard. 
The Ruku Free blade has been designed for the sport of Freediving, slightly narrower and slightly longer it gives the diver a softer kick, this conserving their energy for those longer dives, suitable for pool work and depth.