These shoes are extremely light and have a very thin, but sturdy sole.  The sole grips very nicely with the road.  With most new running shoes, I need many, many miles to break in the sole, so I can feel the road and not run so heavily.  This usually leads to injury of one of my ankles because I would slam too hard to the ground.  With these shoes, I feel the road, immediately, and they help me lighten my step.  I feel great in these when I run.  My stride feels more natural and do not need to adjust my stride throughout the run.  I highly recommend these shoes for those that run on the balls of their feel.  These are not recommended for those who may run flat-footed or land on their heel during their stride.