Every question, answered.

It sinks — worth knowing up front. Splash, drip, and a full rinse afterward are all completely fine; cold and wet don't bother the material. But if it actually goes into the tub, it goes to the bottom and stays there, so keep it on the deck or the rim, not hanging over the water.

That's the shape it's built to handle. The wide base bridges a curved or narrow rim instead of needing a flat inch to balance on, and the fins hold the drink so it isn't riding on balance alone. It works the same whether the tub is a rotomolded barrel, a galvanized stock tank, or a bathtub full of bagged ice.

It's built around that exact moment. Stepping out of 39-to-59°F water measurably weakens grip for a few minutes, so the fins do the holding instead of your hand — set the container in from above and it resists tipping and holds steady on its own, no tight grip or twisted lid required.

Measure the bottom, not the rim. A base 2 to 3 inches across settles in — the 40 oz Stanley-style tumbler and a standard vacuum thermos both do. A handled camp mug is the exception; the handle sits where a fin needs to grip.

Yes — sealed concrete and composite decking are exactly the surfaces setup guides recommend around a home plunge, and both stay wet from splash through most of a session. The wide base and the grip on the drink itself work at least as well there as anywhere else around the tub.

It's light enough to carry from station to station and doesn't clamp to anything, so there's nothing to unclip before you move. It rides the deck between rounds the same way it rides the rim — set the drink down, pick it up, go.

Each person's drink gets its own footprint instead of sharing one crowded patch of sand or dock. It sits flat on cold sand, a dock, or frozen ground without tipping the way a thermos balanced on its own does.

Rinse it under the tap or run it through the dishwasher. It's one piece of solid flexible material with no seams or hinges for grit or lake sand to hide in.

It's called the Steadi, molded in small runs in Orange, California by Steadi Labs — veteran-founded and patent pending. Every order ships free from steadilabs.com, with 30 days to change your mind.

No, and it's worth saying plainly rather than letting someone find out at the tub. Those bottles run wide at the base — a Nalgene 32 oz Wide Mouth measures 3.5 inches, a Hydro Flask 32 oz Wide Mouth 3.58 inches, a CamelBak Chute Mag 32 oz about 3.31 inches — all past the 3.15-inch flex ceiling the fins accept. All three brands also sell smaller-bodied bottles; measure the base of any of those the same way, against the 2-to-3-inch range, before assuming one clears it.

It fits, snugly. The Owala FreeSip 24 oz runs about 3.12 inches at the base, right at the top of what the flexible fins accept before they stop seating — the same neighborhood as the Stanley 40 oz. It seats with a push rather than dropping in loose, which is exactly what a container at the edge of the range should do.

Yes, because it was never depending on the rim to begin with. A soft-sided or inflatable tub has no rigid lip to bridge, so the base does its job on the deck or floor next to the tub instead — the same wide-base, fin-grip mechanism that works on a rotomolded barrel's curved rim works just as well set down beside an inflatable one.

The tub deck itself, right where the tile ledge already sits — that's the intended spot. That ledge is narrow, usually tiled and slick when wet, and often already crowded with soap and shampoo, which is exactly the kind of surface the wide base is built to hold on without needing a flat, clear inch of its own.

They're solving two different problems, so yes. A mat or drip platform manages the puddle and the footing at the entry point — a real job, and one it does well. It doesn't give a drink anywhere to go; a cup set on top of one still has no dedicated spot and can still tip. This handles the drink specifically, and works alongside a mat rather than replacing it.

Yes — nothing about it is limited to a single spot. One at each station in a contrast-therapy circuit means a drink is already waiting wherever you land next, instead of getting carried back and forth across a wet deck between rounds.

It solves a specific, recognizable annoyance for anyone already plunging — the rim that tips a drink into the water, the deck with nowhere dry to set one down — which is the kind of gift that gets used the first week rather than shelved. For a club or a group event, it also travels well: light, doesn't clamp to anything, and works the same on sand, a dock, or a deck.

No — it's built around being handled by hands that just came out of 39-to-59°F water, not around handling in a warm room. The flexible fins hold the container by its bottom inch the same way whether the base going in is dripping cold or bone dry, and the whole point is that a hand too clumsy to manage a tight grip right then doesn't have to.

It can stay out there. It's one piece of solid flexible material with no clamp, hinge, or seam to seize up or trap water, so leaving it on a wet deck between sessions doesn't ask for anything special — rinse it off if it picks up grit or sand and it's ready for the next round.