My very active 21 month old son has been wearing these for a few months and they have quickly become our go-to shoes.  They are really easy to put on his chubby feet, and stay secure with a single velcro closure.  The sole is flexible and very lightweight (as is the shoe as a whole), but feels substantial enough to be protective on rough terrain.  Plus they look great and the little guy seems to like them as well, so I just ordered a second pair in a 1/2 size up.  I honestly don't have a single complaint about this shoe -- Highly recommended.