Resize woocommerce product feature image

Theme: Catch Responsive WP version: 4.1.2 I've resized image dimensions in Woocommerce Settings > Products > Display > Product Images and then Regenerated Thumbnails and nothing changes. I want to reduce the size of the Single Product Featured Image displayed (its huge). And I would like to reduce the Related Products thumbnails (they're huge also). Woocommerce says these sizes are controlled by the theme and that by making the adjustments to the image sizes in the Woocommerce settings a "matching" of size/resolution is accomplished. That's all fine, but what I want to do is reduce the displayed size of the images which seems like that is a theme function and not the plugin function. I noticed that previous posts for help with this have gone unanswered, I hope my request is provided a solution. Thanks