What is the sauna lined with?

The sauna is lined with a radiant reflective barrier that is non-toxic and non-out gassing. It insulates the sauna, protects the wood from heat stress, and most importantly reflects infrared energy directing significantly more infrared to your body than in all wood interior infrared saunas. Our lining is made in the US. For more information on the benefits of reflective linings, read here: http://www.nearinfraredsaunaexperience.blogspot.com