Some products are subject to shipping restrictions and cannot be shipped to certain states and zip codes.
If an item has restrictions, it will have a badge assigned to it. 
There will also be a note on the product detail page to alert customers to the restriction:
Detailed information about the shipping restriction can be found on the new Restrictions tab on the product detail page:
When you enter checkout, you will be notified if any items in your cart have restrictions. After you choose a shipping address, your order will be checked to see if it violates any restrictions. If an item can’t be shipped to your chosen address, you will see a pop-up alert, and you’ll be given the opportunity to remove the item from your order or change your shipping address.
