Review on Polar Tech Leakproof Viscous Refrigerant by Fernando Beck

I've been buying these cold packs for years. From time to time I have had complaints from customers that they were warm when received. I thought it was warm weather but now it's been very cold everywhere and we still get complaints every now and then so I tested them myself. I put 1, 2 and 3 packs in 3 separate insulated containers and tested them after 24 hours. By then all the ice packs were warm. They didn't stay cold at all. I have since bought another variety and they stay cold for 24 hours with only 1 ice pack and are still partially frozen after 26 hours. I haven't tested 1 yet, but 2 cold packs stay cold for over 2 days. The sad thing is that they are both made by Polar Tech. I really have to wonder if these are real IB6s because instead of blue ink they were printed in black ink. I can't use it. money thrown away. Won't buy this again.