HTS code 9902.13.45 covers "Tank tops of knitted fabric of man-made fibers, containing elastomeric fibers, each such top with textile or polymer-based electrodes knitted into or attached to the fabric and that incorporates two snaps designed to secure a module designed to transmit heart rate information from the electrodes to a compatible monitor (provided for in subheading 6109.90.10)" under the US Harmonized Tariff Schedule. This is the official duty rate charged by US Customs when this product is imported into the United States, sourced directly from the U.S. International Trade Commission and refreshed daily.