Is the Purple Original Mattress worth it for back and hot sleepers?

How the Purple GelFlex Grid actually works

Here's what I'd want to know first: the top layer isn't foam at all, it's a grid of hyper-elastic polymer built in a waffle pattern, and that's the whole trick. Under light pressure, the little walls of the grid buckle sideways instead of compressing straight down, which is why your hip and shoulder settle in while your lower back stays held, all in the same layer, with no memory foam settling-in delay. Because it flexes the instant you move, it responds with you rather than half a second behind you, which is the actual fix for that laggy roll-over feeling. The grid is also mostly open air, so heat moves through the columns instead of building up under a dense layer, the way it does in a closed-cell memory foam that traps warmth against your back all night. Underneath that grid sit the Stable Base Foam layers, and that's the bit doing the actual firmness, keeping your spine level while the top layer handles the cradling. That split, soft response on top, firm support underneath, is how Purple manages to be pressure-relieving and firm at once. It's not one material trying to do two jobs, it's two layers each doing one.