Solstice Inflatable Cold Plunge Tub

In this solstice inflatable cold plunge tub review, the Solstice tub ranks seventh of eight in our 2026 best cold plunge tubs guide and takes the Best low-cost two-person tub label at $449.99. It is an inflatable PVC plunge bath that holds 100 gallons, seats two adults, and measures 59 by 31.5 by 30 inches, so two people can sit or lie down at once. The 3.8-star average from 39 Amazon ratings is the second weakest score in the guide, and the tub ships with an inflation pump but no chiller or cooling hardware. Buyers who want an inexpensive shared tub and are willing to add ice or a separate chiller are the right audience here.

That 30-inch depth matters more than it sounds, because it lets you lie back with your shoulders and chest under water instead of standing upright like many budget tubs. The drop-stitch PVC shell traps an insulated pocket of air that slows temperature swings, and the included insulated lid uses buckle locks and carry handles to hold cold in and debris out between sessions. In practice, the two integrated connection points double as drain valves and accept hoses, filters, chillers and heaters sold separately, which means the setup can grow with your budget. The 100-gallon capacity keeps refills manageable, though a full tub weighs far more than its 30-pound dry weight suggests. However, the tub has no built-in cooling, so expect to reach 37 to 42°F only with added ice or a purchased chiller.

At $449.99, the Solstice undercuts every other two-person tub in our guide, and that price gap is the main reason it stays on the list despite the mixed 3.8-star rating. By contrast, the chilled tubs in the guide cost far more but hold temperature on their own, so add ice or a chiller to your math before comparing totals. On top of that, the warranty is described only as Manufacturer Warranty, with no stated length, and the lower rating suggests quality varies between units. Even so, no other inflatable here seats two adults for under $500 with an insulated lid in the box. If you want a low-cost cold plunge for two and can supply the cold yourself, this is the one to get.