This is an exchange voucher! When purchased, it provides you will a 1 time exchange of a single item you ordered for another size or colour of that same style. 

1 voucher = 1 exchange

If you decide not to use your voucher, it can refunded off your order or kept to be applied on a future purchase. Voucher are eligible for refund up to 30 days from delivery. After 30 days the vouchers are non-refundable and are kept on the account for future use.