These are great! We have bought numerous pairs (every time either of my kids get a new pair of shoes).  Both of my kids are old enough to tie their shoes and can do so fairly easily, but they both like the ease of turning their daily sneakers into slip-on shoes.  And, honestly, it saves us a few minutes in the morning when we are rushing to get ready.  They can be cut to any size and worn with the clasp inside or outside the shoe (my kids prefer it not showing on the inside).  The only problem with these is that they aren't reusable once you cut them.  That means you keep buying more, but you go into it knowing that.