Dear Ben,
It is completely related to WooCommerce.
Yes, this feature is available on WooCommerce.You can follow the steps below:
WooCommerce > Products > Add New > Name any product
Go below under settings.
Choose Variable Product from the drop-down menu in the Product data.
Click on Attributes and choose Custom Product Attribute from the drop-down and click on Add. There you can name it Size and set Small | Medium | Large |
Extra Large
as the option and save it.
Don’t forget to check the box on Visible on the Product page and Used for Variations check it on your site.
Click on Variations just under Attributes
Note: You can go through WooCommerce documentation or video tutorials to learn about features of WooCommerce for complete guidance.
Best Regards!