Hello Ccort
The Half Fare option is only to be selected if you have a Half Fare Travelcard (generally reserved for residents or frequent travellers to Switzerland) or a Swiss Half Fare Card (for international guests).
If you do not have one of those products, you should not entered it in the traveller’s data and you cannot therefore purchase the Day Pass, only the Saver Day Pass (available to all, but with variable prices). The Saver Day Pass allows you to travel throughout Switzerland - however, it is not refundable or subject to exchange. Here you will find the validity map.
If you’re travelling for more than two days, take a look at our offers for international guests. Otherwise, the Saver Day Pass is the best option for a day’s travel with many transfers on public transport.
I hope it helps and wish you a wonderful trip,
Chiara_S