No, you do not need to buy a post bag to do a return unless you want to do so.
Please ensure that the item is in its original box and packaging, packaged up so that the shoe box is not exposed. Please include the invoice and return form with the reason for your return (exchange, refund (only full price items) or credit).
Any shoes sent back without a box will not be accepted for a return, and will be sent back to the sender. This rule applies to all other items that are going to be sent back for a return.