Taking a sit-down break is much more enjoyable when you don't have cold snow seeping through the butt of your pants, or pointy rocks jabbing into your arse. This is where the Therm-a-Rest Z-Seat comes in handy. This fold-up seat cushion weighs a mere 2 ounces, and the Z-Seat's closed-cell foam makes a comfortable cushion while you enjoy lunch or a snack.