SunFunGames Inflatable Cold Plunge Tub, 105 Gallon

The SunFunGames BYG-001 sits at number eight in this guide, and at £54.99 it undercuts both Zennest tubs named alongside it, at £399.00 and £109.99. It is a round, freestanding inflatable cold plunge with a cover, cushion, drain, faucet and pump in the box, rated 4.5 out of 5 from 41 ratings. It is also the tidiest example of the problem this guide keeps running into: the name and the bullet points sell a 105-gallon tub, and the Capacity field in the specification table says 115 gallons. Ten gallons apart, in the same listing, with nothing to tell you which figure is the real one.

The same split runs through the rest of the page. The bullets describe a shell of polyester, nylon and PVC with a pearl cotton lining; the Material field says high-density polyethylene and plastic. The bullets put the weight at 9 pounds; the specification says 3.8 kg, about 8.4 pounds. Neither gap makes it a bad buy at this price — an inflatable tub that 41 buyers have rated 4.5 out of 5 is doing something right — but it does mean you should check the tub you receive against the size you need, rather than against the headline figure. Everything below is drawn from the Amazon listing as it stands and not from any test we have run.