This is the additional cost for express shipping (in addition to the amount in the listing).
I usually have a pretty long list of orders. I have to respect priority. Please check my shop announcements on the front page to see for sure when I am shipping if it is important. Be sure and tell me all details in the note to seller at time of purchase or your order could be delayed. All Etsy gives me is your email. So please remember size of shirt, name, number and colors if different from what you bought, a phone number is helpful also.
If you are under 2 weeks, I strongly recommend you buy the express shipping.