Short answer: yes:)... More detailed answer: This pad is made up of durable (not-puncture proof but abrasive and tear resistant) nylon outer material bonded to open-cell foam. When it's rolled up and the valve closed, the foam is collapsed (similar to a scrunched up sponge). When unrolled and the valve is open, the air rushes in as the foam expands thus allowing it to self-inflate. The Thermarest Trail Pro Pad does this exceptionally well because of it's two inches of foam. You should see full inflation in about 10 minutes IF it is stored properly prior to use (unrolled with valve open). If the pad feels to soft after fully inflated, it is perfectly fine to blow in a couple of breaths. I usually fill it up a bit more firm than what is comfortable and then lay on it, releasing the air slightly until I hit the "sweet spot" or, in other words, the perfect amount of comfort. This is very hard to do in an air-only mattress... Once you get the pad, take it out of the package, unroll, and let sit for 24 hours with the valve open. This will allow the foam to regain it's memory and work properly.