It's good and maybe it's thicker than mats advertised as 1/2-inch, but 5/8-inch is exaggerating a little. I even tried to measure it across a land instead of a groove and it's still less than 5/834;. I got it for a bedroll. It's pretty soft but even with nothing on top of it, it does cushion your bones on a hard surface. It weighs less than a firmer mat would and that's not nothing.
Rating: [4 of 5 Stars!]