Every question, answered.

That's the whole reason it's shaped this way. A narrow base can't handle a tilting armrest or a moving glider pad; the wide flexible base spreads across either one instead of balancing on a point, and the fins keep the drink from walking loose as the chair rocks. Push it off level and it settles back.

That's the scenario it's built around. Set the base on the glider's arm, your lap, or the floor within reach ahead of time, and the drink stays where you left it. You still need one working hand to place a bottle in it, but you don't need your eyes.

Measure the bottom, not the rim. A base of 2 to 3 inches across settles in — the 40 oz Stanley does. Handled mugs don't; the handle lands where a fin needs to grip.

No. Nothing screws into the wood and nothing clamps to a rail. It sits on top of the arm, the floor, or your lap, and it works the same on a hand-caned porch rocker as it does on an upholstered glider.

It works at least as well on hard, flat surfaces as it does on the arm — so the rail cap or a side table are fair game too. The same wide footprint and grip that handle a moving armrest keep a bumped drink from sliding on a still one.

No. It sits on the chair or on you, not on a fixed table, so it travels with you instead of getting left behind — which is actually the problem it solves, since the side table stays put while the rocker doesn't.

Rinse it or run it through the dishwasher. It's one piece of flexible material with nothing to come apart.

It's one piece of matte material in a muted color, with no clamps or shine to it. It reads more like something that came with the chair than something bolted onto it, whichever room it's 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.

It's the opposite — the base is what keeps that ring off the wood. A sweating tumbler or koozied can only touches the base's exterior, so the moisture that would otherwise sit directly on varnished wood or upholstery collects on the base instead. It doesn't insulate the drink itself, so a hot cup of coffee stays hot and a cold glass of sweet tea stays cold; it just keeps the condensation off the arm or the rail cap.

It's one piece of molded material — there's no separate spring, clamp, or fabric flap to fatigue or work loose the way a caddy's tuck-in flap does. The flex that lets it settle back through a rocking arc lives in the material itself, not in a mechanism, so there's nothing hidden that fails first from a summer of porch use or months of nightly gliding.

Both, though the arm is the steadier of the two. A nursing pillow shifts with every knee adjustment in a way a padded armrest doesn't, and the wide base spreads across that soft, uneven give better than a narrow-based cup would — but for a full tumbler through a long feed, the armrest or a nearby flat surface holds more reliably than your lap.

It travels. Nothing about it is mounted or built into either chair, so the same one that sits on a porch rocker's arm in the evening works on a glider's arm at 3 a.m. Households that use both a porch rocker and a nursery glider regularly often keep one for each anyway, just to skip carrying it back and forth.

It fits both occasions. It arrives ready to use with nothing to assemble, ships free, and comes in muted colors that sit quietly on a hand-caned porch rocker or an upholstered glider without reading as a gadget. For a shower gift, it solves the 3 a.m. one-handed problem new parents haven't hit yet; for a porch rocker, it solves one most owners have quietly worked around for years.

Yes — the grip comes from the wide base and the fins holding the container, not from friction against a specific arm material, so it works the same on painted wood, bare wicker, or molded resin. The one thing that changes by material is how much a drink would otherwise slide on its own: varnished wood gets slicker once condensation hits it, while textured wicker or resin already has more natural grip — but the base doesn't depend on either.

A hard-sided sippy cup or kids' bottle with a base in the 2 to 3 inch range settles in the same way an adult's tumbler does. A juice box or pouch doesn't have a rigid base for the fins to grip, so that's not a fit — a hard-sided cup or bottle within the size range is the one to reach for.

Yes. The ottoman is flat-topped and padded rather than curved like the armrest, so the same wide base and fin grip that handle a sloped or convex surface work at least as well there — it's simply a stiller surface to set it on.

The built-in mesh pocket on a rocking camp chair is sized and shaped for that one chair's frame, not for what actually gets carried to it — reviewers describe it as too shallow and floppy to hold a real bottle or tumbler upright, with tipped cans the recurring complaint. This isn't tied to any one chair's frame; the wide base spreads across whatever surface is available — the camp chair's arm, a porch rocker's rail, a glider's ottoman — and the fins grip the container's actual base instead of relying on a fixed-size pocket.