The Leil® Black Cube includes a gravity-based ventilation system for efficient airflow. The intake vent is located below the heater, as recommended by most manufacturers, with 3–4 total vent openings for proper air circulation. Exhaust vents on the back wall help maintain a steady flow of fresh air throughout the sauna for consistent comfort.

The Leil® Black Cube features a two-tier bench system that allows bathers to sit higher in the sauna, closer to the ceiling where heat naturally rises. This design provides a hotter upper seating area while the lower bench offers a more moderate temperature, giving users flexible comfort options.

The Leil® Black Cube is constructed from durable Thermo-Pine, a thermally treated wood designed for excellent stability, weather resistance, and long-term outdoor performance. This strong, low-maintenance material makes it well suited for year-round use.

Designed for up to four people, the interior features smooth alder benches that provide comfortable seating and a clean, natural look. The open layout creates a practical, relaxing space for both personal use and small group sessions.