We love Merrells but have been disappointed with these.  They are really small, my son who measures an 11.5 is wearing a 13 and my son who measures 2.5 is wearing a 4 , both with just about a thumbs width (women's) to the end of the shoe from the end of their big toe.  My 6 year old has worn them for about a month and then the loop that holds the Velcro strap tore and the strap is useless.  They do provide good traction and the rest has held up to active boy play.