Sorry, No. All sales are final.
If you order the wrong size please notify customer service within 48 hours so they can update your order item to the correct size (if it is available in that size). Please do not create a double order in the correct size and ask to refund the incorrect size. Customer service will not refund any double orders! The best they can offer is to convert the incorrect item to store credit if the item(s) has not shipped yet.