Overview

Amazon has merged two separate material‑composition attributes into a single mandatory field called fabric_type, effective for all new apparel listings created after the rollout date. The change streamlines data entry but introduces validation rules that sellers must follow to keep their listings active. Understanding the new requirement is essential for anyone selling shirts, dresses, traditional garments or any other clothing category on Amazon.

Key Points

• One attribute replaces two — The legacy material_composition field is retired, and every new apparel listing must now supply its composition exclusively through the fabric_type attribute.
• Built‑in validation enforced — Amazon’s system checks each submitted value against an approved list of formats; entries such as “cotton‑poly” will be rejected, forcing sellers to use the exact syntax Amazon expects.
• Free‑text flexibility retained — Despite the validation, sellers can still describe blends in their own words as long as the format matches the accepted pattern, for example “80% cotton, 20% elastane”.
• Existing ASINs not auto‑blocked — The validation logic applies only to new listings or updates; current listings keep their old values unless the seller manually edits them.
• Automatic migration of values — When the change was implemented, Amazon copied data from the deprecated material_composition field into fabric_type, so sellers may see their inventory display the new attribute without any action.
• Broad category coverage — The rule spans dozens of apparel categories, from basic tees and jeans to cultural garments such as kurtas, kimonos and sarees, across all Amazon marketplaces where those categories are available.

How the Change Works

1. Enter fabric_type during creation — When adding a new product via the one‑by‑one tool, sellers type the composition into the fabric_type box; for a men’s polo made of a cotton‑poly blend, the entry might read “65% cotton, 35% polyester”.