Blurry images in Product Thumbnails

Hello, I have an e-Shop http://shop.arturolaime.com I’m using Enfold with Woocommerce. I noticed that the product thumbnails are showing really blurry. The new update of Woocommerce put the display options in the customizer, but there is no option to edit the size for Product Thumbnails, just for Single Product Image and Catalog Images. I tried to add a custom code on the quick Css but it didn’t work. I also tried to use the plugin Simple Image Sizes, but again there is no change in the quality. I ran out of ideas. Do you have some suggestion? I would really appreciate an answer.