Most cooling pads only work if you remember to freeze a pack first. Norvyn works the moment your cat lies down.
The reason is CryoCore, a pressure activated cooling core developed by Harvard materials scientists. Your cat's own weight switches it on, and it pulls heat out through her belly and paws, the two places a cat actually releases heat. When she steps off, it releases that heat and is ready again in minutes.
Every other cool surface equalizes. Tile feels cool for about 20 minutes, then it absorbs her body heat and turns warm underneath her, which is why she keeps shifting to new spots all afternoon. Cheap pads are worse. They warm up in minutes, and the flimsy ones split and leak. CryoCore does not equalize. To your cat it feels like a fresh patch of tile that never runs out, so she can stay in one spot for hours and it stays cool the entire time.
Three layers do the work. A silk soft cover that feels more like a blanket than anything medical and stands up to claws. The CryoCore cooling core inside. And a non slip base that stays put on tile, hardwood, or carpet.