This fin is for lady's use . Coco fin can catch water firmly by bending central blade area while down kicking . The fins have epoch-making jet hole , which entrance is wide .
But the jet hole is tapered . So , the hole can produce strong jet water stream in spite of weak lady's foot and it can make tremendous propulsive force . The foot pocket softly matches booties of size from 23 to 24.5 cm .