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(More customer reviews)I had some other ice packs for our cooler. They worked OK but I did not feel like they stayed cold for very long. The first time I used these, they sat in my cloth cooler, in my car, for ten hours. I took my food out when we got to our wknd destination. I left the ice packs in the cooler after I emptied it. 2 days later, when I went to pack up to go home, I found them to STILL be quite cold. They kept my things cold enough to get home. I was amazed. I'd buy more in a heartbeat! Only criticism that I have of them is that they take up a little more room than my old ones but I'll take their efficiency over the capacity.
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Techni-ice HDR 4 Ply - White Sheets No Printing ,(5 Sheets) Better Than Ice or Gel Packs Reusable, Dry Ice Replacement (11X15 INCHES)Techni Ice reusable ice packs.Techni Ice HDR consists of a 4 layer construction. Techni Ice has two outer layers are of heavy duty plastic while the two inner plies are made to resist puncture and holds the main ingredient to Techni Ice, a refrigerant polymer. Techni Ice is made of a puncture resistant material is actually a cross-linked polyacrylate polyalcohol co-polymer refrigerant that's combined with a proprietary secret formula. Even if the plastic rips, the inside layer will hold the Ice in. Hydrating: When new, the Techni Ice comes in extremely thin sheets that require hydrating before freezing or heating. To activate the cells, simply fill a bucket or sink with warm water; cold water will work as well, but warm works best from what we've experienced. Immerse the sheet in the warm water for about 90 seconds while scrunching the Techni Ice. You will know when they are done and the Techni Ice recommends that you leave a thumb indentation in each cell during the swelling to allow room for expansion during freezing. When we hydrated 10 sheets, we found that having all cells submerged during the procedure is important, and even so, when crunching the cells, not all of them will expand at the same rate which required more work to get them to the desired size.
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