The leatherette on my HyperX Cloud Alpha headset started disintegrating after three years. The headset is otherwise in great shape, so I got a set of Brainwavz Gaming Earpads. ("gaming" = memory foam + cooling gel + microsuede)
They're a little tricky to install- especially before you realize how stretchy the inner mesh is- but they're more comfortable than the stock pads were before they started disintegrating. I should have bought these years ago when I first considered it. The cooling gel does warm up pretty quickly, but even then it helps distribute the heat around your ears, reducing the hot spots you get on the stock pads.

Just thought I'd put this out there, since most discussion of replacing HyperX Cloud ear pads centers around the Cloud II, not the Cloud Alpha, making it hard to be sure that the pads will fit. The Brainwavz oval ear pads do fit the Alpha just fine (even if installation is rather difficult), and the Brainwavz gaming/microsuede/cooling gel pads get a recommendation from me.

Also, the fact that I replaced the ear pads rather than using it as an excuse to get a wireless headset speaks to the durability of the Cloud Alpha headset. For a $100 gaming headset, it's well built.