Hi there. please send us your order number and the size you would like to change to. We will try to comply to your request.
In the mean time, you may register as a member at Havaianasbenefits.com which we also provide a free exchange for Qoo10 official Havaianas eStore customers at our official stores. Terms and conditions apply.
However, as the Qoo10 listing are exclusive styles, some styles may not be available at the store.
But you can exchange for different styles at the same price or lower.