they have dinky portable ones on amazon for few hundred. It's great for sweating out, not sure about how vetted the build material is given that silver colored

they have dinky portable ones on amazon for few hundred. It's great for sweating out, not sure about how vetted the build material is given that silver colored coating insides of fabric seems to rub off. also, can't remember the source but I believe excessive use (everyday, 30m+) contributes poorly to testicle health, to the point of making you infertile for a while. I imagine optimal sauna usage would involve using an icepack or alike if you did it everyday.