GLS offers an international returns solution for the following countries:

Belgium
Denmark
Denmark
Estonia (via Itella Logistics)
Finland (via Posti)
France (via Mondial Relay)
Ireland
Italy (via Pronto Pacco)
Croatia
Latvia (via Itella Logistics)
Lithuania (via Itella Logistics)
Luxembourg
The Netherlands
austria
Poland
Portugal
Sweden (via DHL)
Switzerland* (via Swiss Post)
Slovakia
Slovenia
Spain, Czech Republic
Czech Republic
Hungary
United Kingdom* (via Royal Mail)