HTS code 9902.13.84 covers "Smartphone cases, each attached to integral adjustable armbands wholly of textile materials, with such case of polyester-laminated neoprene, incorporating a clear plastic window for visual access to the smartphone screen and a small opening for headphone wires, whether or not with decorative plastic overlay (provided for in subheading 6307.90.98)" 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.