Hi,
could someone tell me what do you call this kind of footwear in the US?
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Sandals. Birkenstock sandals are very popular, and are often just called 'Birkenstocks'.
And another question... is there a difference between a sweatsuit and a tracksuit? I think they are the same...
Yes, no real difference. I tend to hear other terms, though, eg work-out suit, jogging suit, exercise clothes.
Clive