add_action( 'woocommerce_after_shop_loop_item_title', 'sama_woocommerce_template_loop_excerpt', 6 );
function sama_woocommerce_template_loop_excerpt() {
echo '<div class="product-desc"><p>Длина:' .get_post_meta($order->id, 'medafi_543c8330898d3', 5) . '</p></div>';
}
Вот...