Both bio-fin and bio-fin pro are adopted and used by Diving Troop and Special Forces, moreover by Marine Police and Rescue Team at all over the world.
The reason why bio-fin is widely accepted is that its world highest level of fin characteristic is well supported for superior diving force against diver with heavy equipment and for reducing useless fatigue.
Also, spring strap is widely accepted due to reasons that it won't beak and easy to attach so that it might be a real proof that our bio-fin & bio-fin pro are superior and most suitable fin for both leisure diver and all kinds of diver in the world.