As title - I bought the biggest one which should fit me easily but it was too small, my toes would go to sleep. I cut the toes off thinking I could just add a little tape to lengthen them, and they turned out to be nearly 1cm too short. Looks like they would be just what I was looking for if they fit. I now have some toeless surf shoes, no big problem!
I use these on all my shoes now - why bother with knots and bows? These are better - slipping on laced shoes is now perfectly acceptable, because the laces give enough so that you won't wear out the heel tab.