What is the size of THIS product?

You can find the sizing in the Additional Information tab at the bottom of the page

Here is how to find size information for various products.

First, navigate to the product detail page that you want to find the size information for.

Second, scroll down to the  "Additional information" area to view the product sizes.

Also, sometimes the product size will be shown in the inventory field on the right side of the page

product size