ive been trying to fix the “blurry thumbnail” problem for a while now.. and ive come across a few places recommending the process nnaraja described.. eg 1. Get the plugin “regenerate plugins”
2. WooCommerce -> Settings -> Catalog, at the bottom, Change Product
Thumbnails to 550 x 550
3. go to tools-> regenerate thumbnails and then regenerate them
but it doesnt work for me.. im supposed to have my website up in about a week and this is one of the main (but small) things thats holding it back!