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Sauna suits are not meant to be worn in sauna. You are supposed to be naked in there.
Sauna twin is a product that makes you sweat, but disgraces the name of sauna because it has nothing to do with actual sauna.
In a Finnish sauna, yes. In a Turkish sauna, no.
In a Swedish sauna yes, in a Finnish sauna no.
Sauna World Championships are held in Finland, not Sweden. Swedish sauna is about 60 degrees colder than the Finnish sauna.