While specific details about the material are not provided, products like the "SS Olivia 11 AC Blue String Thong MP4 Top" often utilize advanced polymers or polyester blends. These materials are chosen for their durability, elasticity, and ability to manage moisture, ensuring the wearer remains comfortable and dry. The "AC" in the product name might denote a specific technology or treatment applied to the fabric, such as anti-odor or cooling properties, enhancing the wearer's experience.