This mat is AMAZING! Have slept on the hard ground with it, no issues. I am a female side sleeper so the more common foam mats don't work well for my hips as they just end up hurting a lot. This mat keeps my body off the ground while only weighing a pound in my pack!!! It is so comfortable, and the pumpsack is soo awesome! If you don't know how to use it, Google it. Takes seconds to pump up the mat with the (only 2oz weight) pumpsack so don't let the fact that it's not "self inflating" deter you. Shell out the cash, it's 150% worth it.