Please view the below sites for external reviews of the Sauna Rocket:
Amazon:
https://www.amazon.com/Sauna-Rocket-2-Person-Recovery-Relaxation/dp/B081S5K6YV
Top 12 Portable Saunas:
https://industryears.com/best-portable-sauna-tents/
Best in Saunas:
https://www.bestinsauna.com/portable-sauna-reviews/
Dude I Want That:
http://www.dudeiwantthat.com/fitness/sauna-rocket-home-steam-sauna-kit.asp
Trend Hunter:
https://www.trendhunter.com/trends/sauna-rocket