WooCommerce Featured Images are Blurry

Hello - I have 150 kb images that show up very sharp elsewhere on the site - http://chezjillchocolates.com/ - put are fuzzy when used as featured images on the WooCommerce Shop page: http://chezjillchocolates.com/shop I have the images set for 150x150. Does Adventurous Pro have them set for a different size and if so, how do I change it? Thank you