We don't make any requirements on what shipping courier our customers use to make their returns. We do however recommend using a trackable insured service for your safety.
Included in your order package is a DHL return label that can be used to return your order, note that a service fee of $35/€35/£30 will be charged.
For more information see https://icewear.is/en-US/terms-and-policies/return-policy