I'm not exactly SURE on the biggest they will hold, but my lil girl wear a size 10 and there's about 1/3 of the room left for it to be bigger. Hope this helps!
oh yea! My niece just went for the first time last week and wants her own skates. Doesn't make sense to buy new when their feet grow so quick! She wears 13 I think, so I'll be watching...I fanned you, please do the same! I'm new and just listed a few things to get started.