I've had lots of NB shoes, so had confidence ordering these online.  Whoever decided to call these "cross trainers" has not done any cross training!  These offer no arch support and, strangely, no lateral support.  The material across the top of the shoe feels like the same stuff used to make my son's little water shoes.  I did end up keeping these because I walked outside in them and, frankly, they are not bad house slippers.  Please don't order these thinking that you are going to do any type of exercising in them.