How to import product attributes in WooCommerce

To import product attributes in WooCommerce, you need to include the following fields in your CSV import file:

Attribute 1 name - text field
Attribute 1 value(s) - text field, values can be separate by comma
Attribute 1 visible - integer, where 1 is visible on the frontend and 0 is hidden.

You can add the columns multiple times to import several attributes, but make sure to use different numbers, so WooCommerce can recognize those columns are for different attributes:

Attribute 2 name, Attribute 2 value(s), Attribute 2 visible, Attribute 3 name ...

For example: 

You can download a sample import file with product attributes here: https://raw.githubusercontent.com/woocommerce/woocommerce/master/sample-data/sample_products.csv 

Product file can be imported on the following page in Wordpress backend:

Tools > Import > WooCommerce products (CSV)