Adding a product attribute is one of the most popular operations in Commerce. Attributes are a powerful way to solve many practical tasks related to a product. There is a simple process of adding a dropdown-type attribute to a product.
In this video:
Add an attribute called clothing_material with the possible values: Cotton, Leather, Silk, Denim, Fur, and Wool
Make this attribute visible on the product view page, in bold text
Assign it to the Default attribute set and add a restriction