This attribute defines shipping specifications for products, such as 'perishable', 'bulky' or 'promotion'.
If an item is likely to go bad quickly (e.g. food), is very bulky (e.g. garden furniture) or comes as a promotion you can add the 'shipping label' attribute to indicate this.
If you specify a shipping label for a product, you may set according shipping rates in your Merchant Center for this label.