Measures in at about 1/2" or so thick, it is probably the thickest of the ones offered, but still very thin. The pad does provide a water and cold barrier of substantial quality, and it does just about cover the full length of a sleeping bag and width if you do not roll around all over. The point the mat brings to mind is that it provides the most basic cover for terrain and will stop most small rocks or twigs from bothering the user. It however is so thin it will not provide much more than that for complete comfort. Doubling up is hardly an option as the pad is already enormous, measures about 19 1/2" and about 6 feet long or so.