The heading explicitly separates artificial turf from conventional carpet at the 6-digit level. Tufted nylon/polyamide artificial turf falls under 570321, while non-turf nylon/polyamide carpet falls under 570329. The same split applies to other manmade fiber constructions. The key classification factor is whether the product is designed to simulate grass for sports or recreational surfaces.

In a tufted carpet, pile yarn is mechanically needled through a primary backing and secured with adhesive or a secondary backing — the pile is not structurally interlaced with the ground. In a woven carpet, the pile and ground are formed simultaneously on a loom. This construction difference is the primary classification criterion between the two headings.