0403.90.37.00 - Described in general note 15 of the tariff schedule and entered pursuant to its provisions

This HTS category, 0403.90.37.00, specifically covers dried sour cream and buttermilk that contain not over 6 percent by weight of butterfat. These products are further defined by their entry under the provisions of general note 15 of the tariff schedule, indicating specific import conditions or regulatory requirements that must be met. The "dried" designation is a critical classification factor, distinguishing these items from their fresh or concentrated counterparts.

When classifying within this HTS chapter, it's important to differentiate 0403.90.37.00 from its sibling categories. The sibling 0403.90.41.00 applies to products described under additional U.S. note 12 to this chapter, suggesting a specialized classification based on particular U.S. tariff regulations that may involve specific sourcing, processing, or intended use beyond the general butterfat content. The other sibling, 0403.90.45.00, encompasses all "other" sour cream and buttermilk within this sub-classification, meaning it would apply to products that do not meet the specific criteria of either 0403.90.37.00 or 0403.90.41.00.

As this is a leaf node, there are no further subcategories. Therefore, the classification hinges on accurately determining the dried nature of the sour cream or buttermilk, its butterfat content (not exceeding 6% by weight), and adherence to the conditions stipulated in general note 15. Examples of products that would fall here include milk powder specifically derived from sour cream or buttermilk with a low fat content and which has undergone a drying process.