Instant calm. The build feels premium and the cold stays steady.— Emma L.
Trusted by pro athletes from:
Spa at home. Quiet, composed sessions every time.— Marco K.
I thought I be the only one but my entire family has been utilizing from it.— Reyana S.
WHAT'S IN THE BOX
#1 best selling German-Engineered cold plunge
Zennest Cylinder 90
Boost mood & energy, reduce anxiety, sharpen focus, speed muscle recovery, and sleep deeper with cold therapy.
- Six-layer insulated wall
- High-strength UV-resistant outer shell
- Full-body immersion for users up to 6'2"
- Free Shipping
- 1-Year Warranty
- 30-Day Returns
- USA Support
Choose your tub
Order now, ships today.
Free delivery within
—
Order now, ships today.
Free delivery within —
Free Shipping
1-Year Warranty
30-Day Returns
USA Support
❄Pro vs Standard
Standard: Six-layer insulated wall, fits up to 6'2", great for beginners.
Pro: Patented Air-Cavity construction, 10% thicker thermal stack, fits up to 6'4", reinforced rim load tested to 176 lb, dual chiller ports.
↔Dimensions
Capacity 90 gal • Width 33 in • Height 27 in • Length 33 in • Empty weight 9 lb • Fits users up to 6'2" / 280 lb
♥Cold Therapy Benefits
- Soothe muscle soreness and inflammation
- Boost & support immune system
- Improve blood circulation
- Better quality sleep
- Boost energy levels
- Improve mood and mental health
- Reduce chronic pain
⊞Shipping & Returns
Shipping: Free US shipping on orders $100+. Tracking sent within 1–3 business days.
Returns: 30-day money-back guarantee for unused condition.
TRUSTED BY PRO ATHLETES FROM:
WHAT OUR CUSTOMERS SAY
★★★★★
Instant calm. The build feels premium and the cold stays steady.— Emma L.
★★★★★
Spa at home. Quiet, composed sessions every time.— Marco K.
★★★★★
I thought I be the only one but my entire family has been utilizing from it.— Reyana S.
AS SEEN IN
Us vs Them
Zennest
- 6-layer insulation + patented Air-Cavity Thermal Shield (Pro)
- High-strength UV-resistant outer shell
- Fits users up to 6'4" comfortably
- Free from BPA, phthalates & harmful chemicals
- Ships from the USA, fast delivery
- Covered by warranty + 30-day returns
- Reinforced rim load tested to 176 lb (Pro)
- Dual chiller ports (Pro) for precise temperature
Knockoffs
- Very little or no insulation
- Poor quality material that deteriorates after a few uses
- Small size, can't fit comfortably
- Cheap plastics containing BPA & phthalates
- Ships from China, long delivery times
- No warranty coverage or support
- Flimsy rim that collapses under load
- Not chiller compatible
Here's the data
Based on a study of 9,434 people
98%
Felt cold plunging had a positive impact on their health
92%
Thought cold plunging made them feel happier
82%
Started to notice benefits within 2 weeks
94%
Believed Zennest products are great value
Our thriving community
Emma L.Instant calm. The build feels premium, the cold stays steady, and the design actually elevates the room.
Marco K.Spa at home. Materials feel serious and the German-American craft shows — quiet, composed sessions every time.
Ryan S.I'm 6'4" and fit upright comfortably; insulation keeps the temperature consistent for days.
Hannah P.Surprisingly solid. It turns a corner of my apartment into a real recovery space and looks good doing it.
The benefits of cold therapy
Cold immersion is one of the most powerful things you can do for your mental and physical health.
💪
Performance / Recovery
Soothe muscle soreness and inflammation so you recover faster between sessions.
😴
Better Sleep
Calms the nervous system and reduces stress hormones for deeper sleep.
⚡
Elevated Energy
Activates the body's natural recovery processes for jitter-free energy.
😊
Boosted Mood
Raises baseline dopamine levels for elevated mood that lasts hours.
🛡️
Immune Support
Strengthens immune response and helps fight off illness.
🧘
Stress Relief
Decreases the stress hormone cortisol and improves emotional regulation.
🔥
Weight Loss Support
Activates brown fat tissue to help burn calories and support metabolism.
🩹
Pain Relief
Constricts blood vessels to decrease swelling and chronic pain.
100% RISK-FREE PROMISE
Try it. Love it. Or send it back.
We're so confident you'll love your Zennest Standard 90 that every order is backed by a 1-year manufacturer warranty and a 30-day satisfaction guarantee. If you're not 100% satisfied for any reason, we'll make it right.
Free US ShippingOn orders over $100
1-Year WarrantyManufacturer guarantee
30-Day ReturnsFull refund, unused condition
USA SupportReal humans, fast replies
Returns must be in unused condition. See our refund policy for full details.
Frequently asked questions
Will I fit if I'm 6'3" or taller?
Yes. The Pro Cylinder fits users up to 6'4". For full leg extension, our Oval models accommodate users up to 6'7".
How much ice do I need to add?
Most users add 15–40 lb of ice per session depending on tap-water temperature. With Air-Cavity insulation, the water stays cold for multiple sessions.
How long does the water stay cold?
Up to 24 hours on the Standard and multiple days on the Pro, depending on ambient temperature.
How do I keep the water clean?
For long-duration use, pair with a Water Maintenance Pack. Without sanitizer, change water every 3–5 sessions or once weekly.
Can the tub be used outdoors?
Yes — the shell is UV-resistant. In freezing temperatures, stir the water once a day to prevent it freezing solid.
Is the Pro chiller-ready?
Yes. Pro models include dual quick-connect ports compatible with most ice bath chillers — no adapters needed.