Every question, answered.

That's the point of the wide, flexible base — it spreads across a slatted armrest or grips onto a rounded rail instead of needing one true flat plane. Push it off level and it holds steady instead of tipping.

That's the shape's honest weak point: a narrow base under a wide bowl. The fins grip in low, around that narrow base, instead of higher up where the glass is top-heavy — it won't turn a martini into a rocks glass, but it resists tipping a lot better than the tabletop alone does.

Measure the base, not the rim. A base 2 to 3 inches across settles in — the 40 oz Stanley does. A Moscow mule mug's base would settle in fine on its own; it's the handle that doesn't, sitting exactly where a fin needs to grip, so mugs with handles are the honest exception.

No — nothing clamps, clips, or screws in anywhere. It sits on top of whatever surface is nearest, so it travels from the armrest to the rail to the high-top exactly when you do.

All of them in the same evening — that's the design brief. Slatted wood, a rounded rail, tile by the pool, bare grass: hard or soft, the wide base holds its footing on each one instead of needing a flat tabletop.

It's built for the deck and the coping beside the pool, not for floating — set it on the hard surface at the edge and the wide base grips there instead of sliding toward the water. It doesn't float, so keep it out of the pool itself.

The wide base spreads its weight instead of concentrating it under one narrow point, so it doesn't sink into turf the way a rocks glass or a stemmed coupe does on its own. It holds steady on lawn the same way it does on the deck or the rail.

Rinse it or run it through the dishwasher. It's one piece of flexible material with nothing to unscrew or take apart, so citrus and sugar don't have anywhere to hide.

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.

There's no fixed rule, but a lot of hosts keep a small handful moving through the party the way coasters would, since the same base that works on a high-top table works just as well on a rail or the pool deck a few minutes later. If drinks tend to pile up on one shared surface — a rental high-top is the usual culprit — that's typically the spot that benefits most from having a few in rotation.

It's one piece of injection-molded material with no metal parts to rust and no hardware to loosen, so pool splash and a night left out on the deck or rail aren't a problem the way they'd be for something with springs or a fabric pocket. A full season of direct summer sun hasn't been part of what's verified here, so if it lives outside full time between parties, bringing it in when convenient is still the safer habit.

There's nothing porous for a spill to soak into — it's a single piece of flexible material, not the wood grain of an Adirondack armrest that ends up permanently ring-stained after a couple of summers of drinks sitting on it. Rinse a red wine or grenadine spill off the same way you'd rinse off muddled mint or a squeezed lime wedge.

It isn't a fixed anchor, so a hard enough hit can still move it. But the wide, flexible base and the fins gripping the drink's bottom inch mean it takes more than a light bump to send a drink over — a shifted knee, a passing elbow, a kid or a dog brushing past a chair leg all count as the kind of nudge it settles back from, not a knockover. A direct hit is still a direct hit.

A drink rail is mounted hardware — it fits one railing's width and profile, and once it's screwed or clamped on, it stays there for the season. This isn't mounted to anything; it sits on top of whatever surface is nearest, so the same one that was on the rail during cocktail hour can move to the high-top, the pool deck, or the lawn later in the evening without unscrewing anything.

It comes down to the base, not the stem. A martini glass's base commonly runs only around 1.75 to 2 inches wide under a much wider bowl, which puts it under the 2-inch floor — too narrow for the fins to grip. A coupe glass's base sits closer to its bowl's width instead of pinching in sharply, landing it inside the 2-to-3-inch range that settles in fully. A highball or Collins glass follows the same rule from the other direction: its base commonly runs about 2.5 to 3 inches, which is why it fits despite standing taller and looking more tip-prone than a rocks glass.

It solves a specific thing almost anyone who's hosted or been to a backyard cocktail hour has lived through — the drink with nowhere flat to land — which makes it an easy small gift rather than a novelty item. It ships free and is molded in small runs in Orange, California, in colors named for the bar cart, like Mojito Mint and Sunset Spritz, rather than a gadget aisle.

Copper conducts heat well enough that mule mugs can visibly sweat within about a minute of a cold pour, according to the mugs' own sellers, wetting both the metal and the surface underneath fast. The fins grip a mug's base the same as they would any other base that size, handle aside — the handle is still the one spot they can't close around, so mule mugs with handles stay the same honest exception as handled mugs generally.