Hello, @Cube54,
Actually, There is nothing. You set the images settings from the WooCommerce settings to 600 and you upload the product images that have less than 400 size. So WooCommerce stretches the images to set it to 600 that’s why the images appear blurry. I add a new product on your site and set the image to high resolution, you can see in this video there is no issue: https://streamable.com/4iqs8i the image appears just perfect.
Here is the product link that I created: https://home4sport.co.il/מוצר/support-testing-product/
Regards 8Themes Team.