CHECK THE PROVIDED SIZE CHART (in image section above). Sizing is specific to this item and will not correspond with your usual clothing sizeAmplify your confidence in the HydroX Openback Kneesuit in Black - the latest innovation in competition swimwear. FINIS have perfected the most essential details of the race suit, starting with the fabric and the way it interacts with muscle. The threads of the proprietary MemoryFlex™ fabric are positioned to optimize the natural expansion and contraction of the muscle, providing consistent compression for the highest performance. MemoryFlex™ is a smart material that will return to its original shape throughout the stroke cycle, enhancing flexibility and compression. Simply the best, FINIS HydroX. FEATURES: MEMORYFLEX™ FABRIC: The multi-directional weave of our proprietary fabric was intentionally designed to enhance the natural motion of the muscles. SMART MATERIAL: Enhances flexibility and compression throughout the stroke cycle and returns to its original shape. CORE STABILITY: Allows for great flexibility and free range of motion while maintaining core stability and balance through the hips. MADE FOR THE WATER: MemoryFlexTM fabric is a proprietary material thats interaction with water is hydrophobic, decreasing resistance caused by swimming. This allows water molecules to remain unhooked as they come in contact with the fabric. BACKED BY SCIENCE: FINIS worked with world-renowned scientist Redha Taiar whose concentration in biomechanics and anatomy enabled them to develop the HydroXTM. FINA APPROVED]]>