This extra charge is for Priority Express Shipping 1-2 days. It is considered Overnight shipping and is dependant on the time of day that the order is placed. This is guaranteed shipping by the US Post Office once we have delivered it to the Post Office.
We will strive to get the order out as quickly as we can, however if you choose this shipping option it would be a good idea to call or email us to let us know that we have a Priority Express Order as it will show up to us as a regular order until we open the email notification. 
Our number is 434 985 4003 and the email is admin@padacheek.com