New as of 5/15/2017. You can set filters when creating a product in the Design Studio.
What are filters?
Filters will allow customers to search products based upon medium, style, theme, cause, and colors. You can pick multiple filters unless otherwise stated.
How to set filters
Hover over the filter category you'd like to use (medium, style, theme, or cause) and click the desired filter. It will then appear above the categories with a gray background and an 'x' next to it. Click to remove the new filter to remove it.