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For all-season tires in Switzerland, you need to check that they have the three-peak label (mountain symbol with three peaks) to be approved for winter - it's mandatory. After that, it really depends on your region and how you drive - whether you're often in the mountains or on flat roads, it makes a difference. Look at reviews on snow traction and wear, recognized brands like Michelin, Goodyear or Continental are generally safe, but there are also cheaper options that do the job.
The thing with the three-peak label is that it's true in theory but in practice a lot of Swiss all-season tires don't have it and still drive legally in winter - what really matters is tread depth (at least 4mm so you don't get pulled over) and especially testing how they handle on wet and snow before you decide, because a good all-season can be a game-changer but a bad one is a nightmare on mountain roads in December.
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