Rank #4 in Best Cold Plunge Tubs 2026: 10 Ranked, and Why the Numbers Don't Add Up
Keystone Peak Inflatable Ice Bath Tub with Lid, 350L
Price and rating as shown on Amazon when we collected them. Both change.
This is Keystone Peak's inflatable cold plunge tub, the entry at number four in this guide. The listing shows £49.97 and a 4.0 out of 5 rating from 332 customer ratings. It is a 350-litre inflatable tub that arrives with a thermal lid, dust cover, drain valve and pump, and the listing says the extra-large capacity fits users up to 6 ft 7 in.
What makes this one worth a second look is the arithmetic. The theme running through this guide is listings whose stated capacity cannot fit inside the dimensions printed beside it — the Zennest tub claiming 140 gallons from a field reading "20 x 50 x 20 millimetres" is the clearest case. Keystone Peak's numbers hold up: 85 x 72 x 85 centimetres gives an outer envelope of roughly 520 litres, and the stated 350 litres sits comfortably inside that. The star breakdown points the same way — it runs 61 at five stars against 10 at one, which averages to 4.09, and that is what the rounded 4.0 on the page reflects. Everything below comes from the Amazon listing — specs, price and reviews alike — and not from a tub we filled ourselves.
How those 332 ratings break down
An average hides its own shape. This is the spread behind the 4.0 stars.
Specification
Exactly as published on the Amazon listing, field for field.
| Price | £49.97 |
|---|---|
| Rating | 4.0 out of 5 from 332 ratings |
| Stated capacity | 350 litres |
| Item dimensions | 85L x 72W x 85H centimetres |
| Outer volume at those dimensions | 520 litres, so the 350-litre figure fits inside it |
| Item weight | 3 kg |
| Maximum user height (as listed) | 6 ft 7 in |
| Best Sellers Rank | 39th in Soaking Baths |
What buyers actually say
Quoted from customer reviews on Amazon
Verified purchase“Does the job just as you expect it. Used it for a couple of months now, no leaking or anything like that. Satisfied with quality.”
Verified purchase“First order unfortunately has some defects, I got in touch with customer service and I got a replacement in a few days. The new tub is great, no issues at all, highly recommended.”
What it is up against
The rivals it was ranked against in Best Cold Plunge Tubs 2026: 10 Ranked, and Why the Numbers Don't Add Up.
Questions people ask
How much does the Keystone Peak ice bath cost?
The listing shows £49.97, with a 4.0 out of 5 rating from 332 customer ratings.
How much water does the Keystone Peak Ice Bath hold?
The listing states 350 litres. Its own dimensions of 85 x 72 x 85 centimetres give an outer envelope of about 520 litres, so the stated capacity fits inside the tub's own measurements.
What comes in the box with the Keystone Peak cold plunge tub?
The listed included components are a dust cover, handbag, water seat cushion, ice bath, insulation cover, support rods, support rod rubber sleeve, rubber ring, water valve, drainage hose and inflatable pump.
What assurance does Keystone Peak offer?
The listing states a 5-year assurance, and says there are no complex parts and no subscriptions.
How tall a user does the Keystone Peak ice bath fit?
The listing says the extra-large capacity fits users up to 6 ft 7 in. The tub itself measures 85 centimetres long and 85 centimetres high.
Can the Keystone Peak inflatable tub be used indoors?
The listing says it can be used in a home gym, patio or bathroom, and describes it as a space-saving option for regular cold therapy.
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