Since July 1, 2021, all products shipped to EU countries need HS (Harmonized System) Codes. Customs officers must use the HS code to clear every product that enters or crosses any international borders. Without them, your order might get delayed.
If your ecommerce platform (like Etsy) asks for HS Codes, you can find them in this spreadsheet of all Printful products and their HS Codes (last updated in February 2025). Just search for the product you’re selling to get the right code.