Oversized thumbnails

Look at the source- thats a background image. This is theme or extension functionality (some kind of zoom?).

Compare to core https://dl.dropboxusercontent.com/s/18zwozyev4nhkm0/2017-04-10%20at%2012.20.png We use SRC and srcset.

Not much we can do here as the functionality is not coming from WooCommerce itself.

Thanks Mike