This is the classic rainbow that everyone needs to own.  I used to have the thick ones like these in my early 20's and then transitioned to the thin sole rainbow.  The quality is the same but the thicker sole provides plenty of cushion to prevent bruising your heel if you step on a pointy rock.  Ive transitioned back to the thick ones after about 8 years.  These give much more arch support than the thin rainbows and will hold up and last you years as i have experienced over the past 15.