Enlighten InfraNature Duet Sapphire 4-Person Slope Roof Hybrid Infrared/Traditional Outdoor SaunaThis hybrid sauna is spacious enough to seat four people and as a hybrid sauna, it uses both electric heaters and infrared heaters. This combination offers an effective way to raise body temperature to have the desired effect. Infra red heaters penetrate through the skin deep into the body and traditional electric heaters warm the air around you. Harvia electric heaters in particular are designed specifically for sauna use. As a larger variant of the