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Hi Lior,
Welcome to MySwissAlps!
Briefly, the Swiss Travel Pass Flex provides free travelling on selected travel days within 1 month from the 1st day of validation. Under the current promotion, the pass is valid for 3 months and includes extra free travel days depending on which ticket you purchase.
So yes, if you purchase a 8-day Swiss Travel Pass Flex, you will get 2 extra days of travel free and you can choose to validate it on the 1st and use the remaining days for travel between the 6th to 15th. I don’t know what your itinerary is like but I’m guessing you need a ticket to travel on the 1st to get to your base and would only be travelling extensively from the 6th to 15th. In which case, I would consider combining a Saver Day Pass and a regular Swiss Travel Pass. Of course a Swiss Travel Pass Flex works too.
You can find more information about how to use the Swiss Travel Pass flex here: http://www.myswissalps.com/swisstravelpassflex. Click on the promotion tab for information about the current promotion.
Links to the regular Swiss Travel Pass and Saver Day Pass below:
Hope that helps.
Regards,
Anna