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Best seller
Ice Baths
Kaldera Plunge 320
320L foldable cold plunge tub with reinforced steel frame
Every health claim on this site links to the peer-reviewed study behind it
One-time purchase
£109.00
or 4 interest-free payments of £27.25 with Klarna
In stock
- Free UK & EU delivery over £100, typically 5–10 working days
- Full refund on unused items returned within 30 days of delivery
- 30-day returns
- Ships from UK & EU warehouses - no customs charges
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- 30-day returns
- Free UK & EU delivery over £100
- Full refund on unused items
up to 6'4"
Fits adults with room to submerge to the shoulders
800g/m²
PVC-coated tarpaulin over a powder-coated steel frame
~80%
Insulated lid cuts heat gain between uses
under 2 min
Folds flat for storage
down to 3°C
Chiller-ready for consistent temperatures
- Double-stitched seams and welded floor stay watertight through daily use
Why it works
About this product
The Kaldera Plunge 320 is our best-selling tub for a reason: it fits a full-grown adult up to 6'4" with room to submerge to the shoulders, and it folds flat for storage in under two minutes when the session's done.
The shell is built from 800g/m² PVC-coated tarpaulin over a powder-coated steel frame, so it holds its shape under load instead of bowing at the sides like cheaper folding tubs. A double-stitched seam and welded floor keep it watertight through daily use.
Pair it with a Chill Core chiller for consistent temperatures down to 3°C, or run it with ice for ad-hoc sessions. The included insulated lid cuts heat gain by roughly 80% between uses, so a chilled tub stays cold overnight.
Specifications
- Capacity (L)
- 320
- Layers
- 3
- Lid
- insulated, included
- Drain
- bottom drain valve
- Material
- 800g/m² PVC-coated tarpaulin, steel frame
What to expect
Your first weeks, mapped out
- Order
We dispatch from our UK and EU warehouses and email you a tracking number as soon as your order leaves the warehouse.
- Delivery
Typical transit is 5–10 working days, free tracked delivery on this order - no customs charges within the UK or EU.
- Setup
The tub unfolds in minutes and folds flat again in under two. Pair it with a Chill Core chiller or run it with ice for ad-hoc sessions.
- First sessions
The research clusters around 11–15°C for roughly 11–15 minutes. Enter gradually and build up from shorter dips.
Common questions
Everything you need to know
Will I actually fit in it?
The Plunge 320 fits a full-grown adult up to 6'4" with room to submerge to the shoulders. It's our best-selling size and the standard all-rounder for most adults.
How long does delivery take, and what does it cost?
Typical transit is 5–10 working days from our UK and EU warehouses. At £109 this order qualifies for free tracked delivery (free on all orders over £100), and you'll get a tracking number by email as soon as it dispatches. No customs charges within the UK or EU.
How hard is it to set up and store?
It folds flat for storage in under two minutes when the session's done. The powder-coated steel frame holds its shape under load instead of bowing at the sides like cheaper folding tubs.
Do I need a chiller, or can I just use ice?
Both work. Pair it with a Chill Core chiller for consistent temperatures down to 3°C, or run it with ice for ad-hoc sessions. A chiller is what makes a daily routine sustainable; ice is the cheapest way to start.
Which chiller matches this tub?
The Chill Core 300 is rated for tubs up to 350L, which covers the Plunge 320 comfortably. The included insulated lid cuts heat gain by roughly 80% between uses, so a chilled tub stays cold overnight.
What temperature should I run it at?
The recovery studies pooled in Machado and colleagues' 2016 meta-analysis clustered around roughly 11–15°C - not ice-water extremes. Colder is not reliably better within the studied range.
What if it's not right for me?
You can return it within 30 days of delivery for a full refund, provided it's unused and in the condition you received it. UK and EU consumers also have a statutory 14-day right of withdrawal on top.
Complete the setup
Better together
30-day returns
Full refund on unused items returned within 30 days of delivery
Read the full returns policyCustomer reviews
Reviews
Marcus Ellery
Been using this every morning since January. The insulated lid genuinely keeps it cold overnight with a Chill Core 300 running - water's still at 4°C by the time I get in.
Priya Nathwani
Fits my husband at 6'2" with room to spare, and the frame hasn't budged after three months of daily use. Folds down small enough to store behind the shed.
Dan Okafor
Solid tub, well made. Only reason it's not five stars is the drain valve is a bit fiddly to seat properly the first few times.
Lucy Fairweather
Upgraded from a cheaper 200L tub and the difference in build quality is obvious immediately - the steel frame doesn't flex at all when full.
