2nd pair of these we purchased. Very lightweight and easy to put on a squirmy toddler.  Velcro is strong so they are a little tough for her to pull off without help - that's a good thing!  No more chasing around for dropped shoes in the car when we reach our destination.  Granddaughter has very wide feet so we bought the XW as we do with other Saucony shoes.  These appear to be a little bit wider.  Not too loose but plenty loose.  Maybe could have gotten by with a Wide instead.  So hard to find XW shoes for toddlers with chunky feet!  The fabric they are made out of is a sort-of neoprene type.  Similar to a water-shoe type fabric.  Love them.