Air Mixing Technology- Saunum's patented air blending system mixes cold, oxygen-rich air from the floor with hot, oxygen-poor air from the ceiling. This solves the discomfort often associated with saunas, delivering heat and oxygen evenly from head to toe-whether you prefer it extremely hot or just warm. European Design- Features an elegant black steel finish that blends Scandinavian design with high-quality materials. Massive Stone Capacity- With a 198-pound stone capacity, this sauna delivers softer, more even heat and the potential for luxurious steam. Himalayan Salt Reservoir- Himalayan Salt Spheres are positioned in the air stream to release beneficial salt ions throughout the sauna for added health benefits. Suitable for sauna rooms from317 to 565 cu. ft.