The Zoggs Racespex Rainbow Mirror is a racing style swim goggle that is Fina approved for competition racing. Due to the fact that it is extremely low volume and super streamline in the water. When racing this is a must, you dont want anything to bulky or large to slow you done. The Lenses are UV Protected which is important as you want to protect your eyes when in the sun. The twin strap makes the goggle stay put when racing as one sits higher or your head and one sits lower, this gives the maximum hold.