“I ice my left knee twice a day, and I hate it. I usually use two ice packs, one beneath, and one on top, with a blanket in between. The gel started leaking from my go to ice packs, so I've been looking for replacements. These are incredible. They're soft and don't get hard when frozen. Not just typical "flexible when frozen," but actually soft. They stay cold long enough. The gel seems somewhat solid, so I'm confident it won't leak.In fact, I think I'm going to stop typing and order another right now.”