I bought a pair for each of my 6 year olds.  My first shoe string attempt (even after reading reviews that said you have to not put it in too tight... what does that mean?) was too tight and my son couldn't get in his foot.  These spring-like laces are impossible (I have skinny fingers) to take out once put in.  I gave myself sores and rope burns trying to undo or loosen the laces.  I was somewhat successful after 3-4 attempts, but then my son broke his arm and only had 1 hand to put shoes on.  Really need 2 hands to wiggle feet in to tight shoes.  Not great for toddlers or early grade school kids.