$prod_categories = get_terms( 'product_cat', array(
'orderby' => 'name',
'order' => 'ASC',
'hide_empty' => true
));
foreach( $prod_categories as $prod_cat ) :
$cat_thumb_id = get_woocommerce_term_meta( $prod_cat->term_id, 'thumbnail_id', true );
$cat_thumb_url = wp_get_attachment_thumb_url( $cat_thumb_id );
$term_link = get_term_link( $prod_cat, 'product_cat' );?>
<a href="<?php echo $term_link; ?>"><img src="<?php echo $cat_thumb_url; ?>" alt="<?php echo $prod_cat->name; ?>" /></a>
<?php endforeach; wp_reset_query();
Above code is working, but I am getting an image of 150px x 150 even when adjustments in Woocommerce are

I need a larger size or full size