Built by Athletes. Refined by Engineers.
Six-layer insulation on every model for steady cold. Step up to Pro for the patented Air-Cavity shell, thicker thermal stack, and chiller control.
Zennest Pro Oval 140-Gallon Cold Plunge — Patented Air-Cavity, Chiller-Ready
Zennest Pro Cylinder 90-Gallon Cold Plunge — Patented Air-Cavity, Removable Liner
OUR Spotlight: Pro Oval 140-Gallon — Patented, Chiller-Ready
Oval comfort. Pro-grade control. Quiet, steady sessions.
Six-layer inner body + air cavity + outer shell, with a 10% thicker stack for slower heat gain and a steadier plunge.
Eight rigid stand walls and a 165 lb rim point-load for confident entry and exit. Watch our Video!
Clean in/out routing for precise temperature control without adapters or messy hoses.
Removable liner lets shared routines stay clean with minimal downtime.
Our Thriving Community
-
★★★★★
"Instant calm. The build feels premium, the cold stays steady, and the design actually elevates the room."
-
★★★★★
"Spa at home. Materials feel serious and the German-American craft shows—quiet, composed sessions every time."
-
★★★★★
"I’m 6'4" and fit upright comfortably; insulation keeps the temperature consistent."
-
★★★★★
"Surprisingly solid. It turns a corner of my apartment into a real recovery space and looks good doing it."
-
★★★★★
"The quality shows the moment you get in; keeping the routine is effortless."
-
★★★★★
"Stability, control, and comfort land together—this is the experience I hoped premium would mean."
-
★★★★★
"The oval posture is relaxed while everything feels tight, quiet, and professional."
Proven Health Benefits
Stress and mood regulation
Cold exposure causes a brief sympathetic spike followed by a parasympathetic rebound, boosting vagal tone and HRV. This “up–down” response lowers stress and improves emotional control, driven by noradrenaline, endorphins, and thermal signaling.
Mood elevation
Randomized controlled trials show that brief head-out cold-water immersion quickly boosts positive mood and reduces tension, fatigue, and anxiety, suggesting it may be a simple, low-cost way to improve mental well-being.
Third-Party Verified Quality
Each batch is independently tested for purity, potency, and safety in cGMP-certified facilities. Tests confirm heavy metals, microbes, and solvents are below detection limits. A certificate of analysis for every lot ensures full transparency and trust.
Faster recovery feel & DOMS relief
Meta-analyses reveal modest decreases in muscle soreness and better perceived recovery versus rest, with effective protocols averaging 40–50 °F for 10–15 minutes. Benefits vary by sport and timing, and performance may dip briefly after immersion.
Why Choose Us Over The Competition?
Zennest
Competitor
Here's the data.
Based on a study of 9434 people.
Frequently asked questions
Will I fit if I’m 6'3" or taller?
Yes. Choose the Oval for full extension and comfortable immersion. Users to ~6'4" typically extend fully; taller users may bend knees slightly.
Can two people use it together?
Yes. The Oval can accommodate couples for shared sessions.
What are the dimensions and volume?
See the Size Guide and each product page for exact footprint and water volume. Measure your doorway and placement area before ordering.
What’s the wall construction?
Standard: multi-layer insulated walls. Pro: patent-registered Dual-Layer Air-Cavity for stronger walls and longer cold hold.
How durable is the fabric and stitching?
2–3× thicker shell with triple-stitch seams for long service life when used as directed.
Is the Pro Oval reinforced?
Yes. Pro Oval includes a reinforced skeleton body with eight stand rods. Tested rim load: 80 kg / 176 lb.
Is the Pro hot-compatible?
Yes, up to 60 °C (140 °F). Standard is for cold use.
Is it chiller-ready?
Pro models have ports for chillers. Standard is not designed for chillers; some owners adapt at their discretion.
What’s in the box?
Tub, lid, hand pump, hoses/drain tube, repair kit, and carry bag. See product page for exact contents per model.
Can I put a small stool inside?
Yes, if it has smooth edges and a stable base. Avoid sharp or abrasive surfaces.
The lid sags. What should I check?
Fully inflate the rim, seat the support rods completely, and tension the cover evenly. Re-seat any misaligned rods.
Can I use it in a shower stall?
Measure first. Some users angle the Oval to fit larger stalls. Protect floors, confirm drainage, and never overload the rim when entering.
How long does the water stay cold?
Varies by ambient temperature and usage. Multi-layer walls reduce refills. Our internal test showed up to 30% better cold hold at 100 minutes starting with cold water. Results vary.
How do I drain it?
Standard: open the base drain/valve. Pro: lift tab and use the quick-drain removable liner for ~60-second resets.
Where should beginners start (temperature/time)?
Many start around 10–15 °C (50–59 °F) for 2–5 minutes a few times per week, then adjust gradually. Not medical advice.
Who should seek medical advice first?
Anyone pregnant or with cardiovascular or other medical conditions should consult a professional before use.
Can I exchange my item?
No exchanges. Please return and reorder.
Do you accept returns?
Yes. 30-day returns.
Who pays return shipping?
The customer pays return shipping.
Do you ship worldwide?
No. USA only at this time.
Best way to clean?
About every two weeks: drain, wash with warm soapy water, rinse, and wipe dry with a soft cloth.
How to keep water fresh between uses?
Follow spa-pool water-management best practices. If using a spa-safe disinfectant, dose per label; cold water slows reaction times. Avoid oils and harsh additives; if salts are used, rinse the liner after.
Do I need a filter?
Optional. Helpful if you keep water between sessions. Many owners simply drain and refill.
Can I fill with hot water from a kettle?
Pro models allow hot use up to 60 °C (140 °F). Mix to target temperature before filling. Do not exceed limits.