I Put the Ultimate Beer Cosy to the Test and it Did Not Let Me Down

By Brent Rose on at

Cosies. They keep your hand from getting cold and your beer from getting warm—what could be better? One that keeps your beer cold for much, much longer, that's what.

Cosiwa are everywhere. You've seen these soft-foam beer can holders usually given away as promotional purposes, adding splashes of colour to otherwise drab construction sites, and your uncle in Myrtle Beach has like 50 of them.

But what separates the Yeti Cooler from all the freebie cosies out there (aside from the price) is that instead of foam and neoprene it's made of 18/8 stainless steel with double-wall vacuum insulation. It's basically a thermos for a beer that will keep your brew cold for a very long time. How long exactly? I decided to find out.

Test #1: Cans on a Hot Day

I Put the Ultimate Beer Koozie to the Test and It Did Not Let Me Down

Yeti makes some of the best drink coolers out there, and they range from the very large—268 beers while maintaining a 2:1 ice to beer ratio—to very small. The Colster is the smallest: 1 beer, no ice. This is the one I tried.

It works like this: unscrew and remove the plastic gasket at the top of the Colster. Put your cold can of beer in. Replace the gasket. Drink.

For the test, I stuck three cans of beer in the freezer to get them down to around -1 C. Then I dragged a space heater into a small bathroom and managed to get it up in a temperature around 38 C. It was hot.

Then I opened the cans and put one in the Colster, squeezed one into an old Coleman Cosy my aunt had (which is probably better than your standard beer cosy), and left one naked to act as a control. I used an OXO instant read digital thermometer to measure all three, swirling them before each measurement to ensure the temperatures would evenly distribute.

The results? The Yeti went all abominable snowman on the others.

I Put the Ultimate Beer Koozie to the Test and It Did Not Let Me Down

As you can see, the Yeti jumped out to an early lead and didn't look back. At the 60 minute mark, it was still just 38.5 F/3.6 C, up from -1. Just over four degrees during the course of an hour in a  near-40 degree room is damned impressive.

By comparison, the rubber cosy was at 50 F/10 C and the control was already up to 63 F/17 C. That's 6.4 degrees and 13.4 degrees warmer than the Yeti, respectively. And no, the Colster didn't sweat at all (though neither did the regular cosy). By the end of the two hours the results were even more dramatic. Keeping cooler meant the Colster's can retained more of its carbonation, too.

Test #2: Glass Bottles at Room Temperature

I Put the Ultimate Beer Koozie to the Test and It Did Not Let Me Down

For the glass bottle test, things were a bit more moderate. I grabbed three glass bottles of Juice Squeeze (don't ask) and submerged them in an ice bath for a couple of hours. The room I was in stayed around 21 degrees C. I then followed the same testing protocol as I did with the cans of beer. While less extreme, the results were essentially the same.

I Put the Ultimate Beer Koozie to the Test and It Did Not Let Me Down

The control was the clear loser here, but it was definitely a closer call between the Yeti and the cosy. The biggest disparity was at the 45 minute mark, when the Yeti was at 45.1 F/ 7 C, the cosy was at 49 F/9.4 C, and the control had shot up to 56.4 F/13 C. Again, less extreme conditions and hence less extreme results. A 2.4 degree difference is not one you're really going to notice while drinking a beer unless you're actively looking for it and comparing. Still, though, the Yeti was the hands-down winner.

One thing I should note is that while I found that cans fit in the Colster just fine, there's a lot more variation in shapes and sizes between beer bottles. Almost all of the bottles we tried were on the skinny side, which left some space between the bottle and the Yeti's walls, which would rattle and almost certainly reduce its efficiency. Also, while you can fit larger cans into the Colster, you won't be able to put the cap down on top of it, again reducing efficiency. It didn't fit much better in the regular cosy, either.

The bottom line

This baby works as advertised. Cold cans stayed very cold, and it doesn't sweat and it doesn't chill your hand. You could also just use it as an insulated tumbler and pour whatever you wanted in there, hot or cold.

The downside is, it's expensive, to the tune of $29/£19 (plus shipping). Sure, it out-performs a normal cosy, but your normal cosy was also probably free. Is it worth it? I mean, look, it's pretty awesome. It does exactly what it sets out to do, and it looks good while doing it. But it's reasonably hard to justify buying something that's generally gifted to you.