How to display search query in view's results page?
Yes, ultimately all the filters send the data using HTTP methods GET/POST. If you are not using AJAX with views then HTTP method GET is used to send the data.

To display the information in header add Global:Custom Text field and add below line in it.

&lt;div&gt;Showing results for $_GET[X] size and $_GET[Y] color.&lt;/div&gt;


Where : X - name of size field
        Y - name of color field
You will get the names from the url generated after search in address bar.