@kkennedydesign No need for custom fieldsets, all of the colour URLs are already available from this.model.get('item').attributes.itemimages_detail; and using that and the colour labels and our image identifiers we can build new URLs based on the target element that's being hovered. It had little to no noticeable affect. It's just the smallest size thumbnail that's grabbed on load, and with pagination/infinite scroll it's fine. When the image to preview the hovered thumbnail is loaded, sometimes there is a split second delay in loading the image from URL but for the most part the experience is quite good.