The long-selling item "TANK TOP" relaunched with mesh material. The TANK TOP MESH uses the "ROICA" yarn that is a raw material invented and produced from the polymer science owned by Asahi Kasei Fibers Corporation. The "ROICA" is a Spandex stretch material with excellent stretch and recovery properties. The cloth has a meshed texture, offering great airflow quality and further adding antibacterial, deodorizing, sweat-absorbing, and quick-drying features. Hence making this tank top a multifunction inner that you can wear comfortably all seasons. Like previous models, the TANK TOP MESH embeds 18 pieces of 130mT permanent magnets in Colantotte's unique Alternating North-South Polarity Orientation (ANSPO™), improving blood circuration and relieving stiffness in shoulder and back sections. Number of Magnets: 18 x of 100mT (1000G) permanent Ferrite magnets Material: Polyester, Polyurethane, Cotton, Eighteen 130mT (1,300 Gauss) Ferrite Permanent Magnets Japan Medical Certification: 221AGBZX00161000 Sizes : S: (Chest) 70 - 80cm (Approx.), M: (Chest) 80 - 90cm (Approx.), L: (Chest) 90 - 100cm (Approx.), XL: (Chest) 100 - 110cm (Approx.)