I ordered the Youth 5.5 for my daughter, who wears Youth 5.0 shoes. I knew that they would be a little big, but...Holy Moly! These things are huge! I wear a 7 Women's shoe and my foot not only fit inside, but had a solid inch from the top of my big toe to the tip of the shoe. I am guessing these (although they say Youth 5.5 are more like an 8 or 9 in women's...if not bigger. Going to have to return them :(