6109.90.10.47 - Thermal undershirts (652)

This classification, HTS Code 6109.90.10.47, specifically covers thermal undershirts knitted or crocheted from man-made fibers. These garments are designed for wear beneath other clothing to provide insulation and warmth. The term "thermal" implies a functional design for heat retention, which could include features like brushed linings, specific fiber structures, or weaves intended to trap air. This distinction is crucial as it differentiates these specialized garments from general knit undershirts.

Within the broader category of "T-shirts, singlets, tank tops and similar garments, knitted or crocheted, of other textile materials, of man-made fibers, men's or boys'", this subcategory stands apart from its siblings. While "T-shirts," "tank tops and singlets," and "Other" encompass a wider range of similar knit garments, HTS 6109.90.10.47 is specifically delineated for those with thermal properties. The "Other" category (6109.90.10.49) serves as a residual classification for any men's or boys' knit undershirts of man-made fibers that do not fall under the more specific definitions of t-shirts, tank tops, singlets, or thermal undershirts.

As this is a leaf node, there are no further subdivisions under this specific HTS code. Therefore, the classification hinges on accurately identifying the garment as a men's or boys' undershirt made from man-made fibers, possessing thermal properties. When classifying, consider the intended purpose of the garment, its construction, and any inherent characteristics that contribute to heat retention, distinguishing it from standard knit tops.