Aqua Sphere Powered Phantom Wet Suit Bio-Stretch Zone - Strategically placed 1mm stretch zone - allows for max range of motion Core Power Zone - Internal support system - improves posture, enhancing hip rotation and lengthens stroke Auto-Positioning Sleeve - 5mm band with visual cues - encourages a high elbow positioning on pull phase of stroke Extended length, reverse-pull zipper with leash for easy on/off and quick transitions Power-Zone forearm panels increase traction during the pull phase of your stroke