SaunaLife Model S1B 1-Person Hot and Cold Immersion Tub in Black

Why we vetted this for natural testosterone

• Dual hot-and-cold functionality lets you switch between immersion therapy without needing multiple units or lots of space.
• Black Thermo-Pine exterior and fiberglass liner reduce risk of harmful off-gassing, weather damage, or coatings that degrade quickly.
• Large interior (approx. 34.4″ dia × 36″ deep, ~124 gallons) supports full immersion, helping you stay consistent in cold or hot exposure routines without bottled water or temporary solutions.

What we look for on this product

• Construction: durable woods (Thermo-Pine), thick fiberglass liner, reliable drainage, stairs for safe entry/exit.
• Feature completeness: does *not* include chiller/heater out of box—need external equipment to control water temperature; connections provided though.
• Support & warranty: lifetime warranty for defects, European craftsmanship, sturdy build—but filled weight (~1,177 lbs) demands strong base and infrastructure.

Straight talk

• This tub offers a high-quality immersion experience that reduces dependence on ad-hoc cold/hot baths, but be ready for the cost of water, heating/cooling, setup, and ensuring the ground/foundation can handle the weight.

Transparency & Disclaimers

We independently select and vet products; if you buy via our link, we may earn a small commission at no extra cost to you. Ingredients, labels, and formulations can change—always check the packaging before use. This information is for educational purposes and isn’t medical advice; consult a qualified professional for personal guidance. If you have sensitive skin, patch-test first and discontinue if irritation occurs. Prices and availability may change without notice.

Last checked: September 16, 2025