6403.12 - Ski-boots, cross-country ski footwear and snowboard boots:

HTS 6403.12 specifically classifies ski-boots, cross-country ski footwear, and snowboard boots that have outer soles made of rubber, plastics, leather, or composition leather and uppers constructed from leather. This category is a subset of sports footwear under heading 6403, focusing on specialized winter sporting equipment designed for snow-based activities.

This classification is distinguished from its sibling category, 6403.19, which covers "Other" sports footwear not specifically enumerated within 6403.12. Therefore, if a boot is intended for skiing or snowboarding and meets the material requirements, it falls under 6403.12, while other types of sports footwear made from leather with the specified sole materials would be classified under 6403.19.

Within HTS 6403.12, further subdivisions exist to refine the classification. The subcategories distinguish between "Welt footwear" (6403.12.30.00) and "Other" (6403.12.60.00). This differentiation is based on the construction method of the boot, specifically whether it employs a welted construction technique, a common method for durable footwear, or other manufacturing processes.