Not as hard as a rock when chilled...Nice!

I've been using this product for pain relief after knee replacement. When refrigerator-cold, it conforms easily to body contour. When frozen, the beads are surrounded by ice crystals, and you have to wit for them to warm up a bit before they get pliable. the "sleeves" for them are velvety and won't slip around, but are a little too thick to allow maximum cold-penetration. If I were designing them, I'd make the packs twice as long.

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