How long do they stay cold for
1414576
20 minutes in my limited experience. Keep in mind there are no covers - offer is wrong - and you need a towel or t-shirt to wrap these up. I failed to do so at first and got an ice burn as a result.
1414577
I could use them for about 40ish mins before they got too warm for my tastes.
1922307
They will still be cold if it is closed and in a decent temperature (in the car or bus), but they would not be frozen. It guarantees frozen things up to 3 hours.
2017755
Not as long as I would like, but it kind of depends on if you have them just lying on top of your puffy eyes or wedged between your back and the bed which would be warmer. I actually will buy a regular larger gel pack next time because their thickness allows them to stay cold longer, but these are fine for very small areas, and you can rotate them if you're not using them all at the same time.
1156758
I cut one apart and used it on my shoulder after rotator cuff surgery; seemed to stay cold for 1-2 hours that way. I use the solid ones in coolers when I travel and are still partially frozen after a 5 hour trip; work pretty good I think. Hope this helps.
1461468
Actually, about 25 minutes..I used it for 8, but by the time I put them back in the fridge, more time had passed and they were still cool!
762929
That's going to depend on how you're using them. We used them to warm up baby bottles, ~4oz of very cold liquid, in a zippered insulated bag, took maybe 5-10 min to reach a warm, drinkable temp. If we left the warmer in the bag afterwards, it would still be noticeably warm upwards of an hour later (but not hot enough to completely warm up another bottle by then). Anything you can do to keep the heat contained will improve the longevity.
861459
They stay colder longer because of the silver backing. They are equally as durable.
1854432
I am using 6 of them and we aim to have them at -20 C when they go on my head and usually leave them for 20 mins (they are between -13 and 0 when I take them off to be returned to the dry ice).
690230
its insulated but it will only stay cold for about 3-4 hours. ice pack is best
1205461
I believe 4-nice and big,well made,cold only lasts for approx. 10 minutes though. Check out the Donjoy Ice system.
1080885
I suppose they sweat after a certain period of time. I put them in a small cooler of mine that I use like a lunchbox. But I use it as more than a lunchbox, really, because I like to have at least two meals with me at all times -- and they last all day -- i.e., at least 8 hours. But I suppose there are days when I don't get home for maybe 12 hours, and the stuff in my cooler is still cool. By then, the fit and fresh coolers are melted inside, but still cold. And obviously, sweating a bit. I just checked the stuff that I put in there at about 8:30 this morning -- almost 9 hours ago -- still cold. Hope this helps. I suppose they sweat after a certain period of time. I put them in a small cooler of mine that I use like a lunchbox. But I use it as more than a lunchbox, really, because I like to have at least two meals with me at all times -- and they last all day -- i.e., at least 8 hours. But I suppose there are days when I don't get home for maybe 12 hours, and the stuff in my cooler is still cool. By then, the fit and fresh coolers are melted inside, but still cold. And obviously, sweating a bit. I just checked the stuff that I put in there at about 8:30 this morning -- almost 9 hours ago -- still... » Read More I suppose they sweat after a certain period of time. I put them in a small cooler of mine that I use like a lunchbox. But I use it as more than a lunchbox, really, because I like to have at least two meals with me at all times -- and they last all day -- i.e., at least 8 hours. But I suppose there are days when I don't get home for maybe 12 hours, and the stuff in my cooler is still cool. By then, the fit and fresh coolers are melted inside, but still cold. And obviously, sweating a bit. I just checked the stuff that I put in there at about 8:30 this morning -- almost 9 hours ago -- still cold. Hope this helps. « Show Less
981896
At least six hours. I fill mine up about 1/4 put in the freezer when it gets frozen I put cold water over the frozen ice and it will stay cold 8 to 10 hours or longer. I love mine.
601247
We did put it in a cooler filled with ice until we got to the bee yard. The temp was 90 degrees and they didn't last but about 1 hour and 20 min. We put them back in the cooler and when we got to the next yard it was cool nothing more and did not keep us cool at all.
1148581
put ice packs in mine. it is cold 9 to 10 hours later. If you preheat the thermos it will go just about 24 hours
1657087
We had them in a fridge. A few were in ice but not for long and they looked fine. Not sure long term.
1508745
I put mine in the bath tub with a few inches of water and let them soak for half an hour or so and then pop them into the freezer! It's that simple. I re-hydrate them from time to time as the part that freezes seems to get smaller over time. These things really keep things items quite cold. I put one on the bottom of my lunch bag and one on top of my food as well. I have no regrets with this purchase!!!
1847884
If you don't use an ice bag not long at all. With a ice bag about 6-7 hours.