Finally, a barrel sauna designed to withstand the rigors of the outdoors! The finest outdoor woods were the starting point for Thermory designers as they set out to create the ideal outdoor barrel sauna. Most other barrel saunas are small and offer little room to relax. Designers spared no expense to engineer their barrels with an amazing 7' 3" interior diameter. The barrel perimeter benefits from their insulation-enhanced 1-1/2" thick and 3-1/2" boards that provide the ideal seal.