Shock Doctor Boys Compression Brief with BioFlex Cup Synthetic The compression brief with BioFlex cup offers superior protection and comfort in a brief-style undergarment Designed with moisture wicking four-way stretch fabric that moves with your body while eliminating sweat Constructed with supportive stretch cotton/poly fabric Mesh cup panel secures the cup and increases ventilation The BioFlex cup is a vented bio-shaped device designed to shield areas where protection is most crucial -- The body of this core protective cup forms flawlessly to your athletic frame, providing unrestricted movement, airflow and comfort