Portable Infrared Archsauna
Sure, the giant whiskey barrel sauna is ten times better than Tuningdome's Archsauna, but it also costs 10 times more. This portable half-dome uses infrared radiation provided by a ceramic heating system to gently warm and relax whatever body part lies beneath its cover. The rest of Tuningdome's description of its sauna is a little difficult to interpret (hopefully the sauna works better than the translation software they used), but I'm pretty sure they recommend it for stress relief, toxin release, improved blood circulation, soothing worked muscles, and certain health issues, such as edema.
Tuningdome says the Archsauna heats to a maximum of 90 degrees C (194 F) in 3 minutes, but due to the infrared heat sources carries no risk of skin burns and emits very low EMF levels. When not in use the device fold in thirds and transports via an included bag with shoulder strap.