I bought this for my 4 year old girl but it was waaaaayyyyy too big for her so it went to my 11 year old. It was not as warm as I had expected, the cold air sneaks in through the crochet holes. But its nice to lounge around in and looks super cute.There is a big hole at the bottom that the feet can fit through although its not big so walking is not easy. Is it functional, noty so much in my opinion. However I don't think kids consider the tail to be used for warming up, its more fashion. Which, she does love just chilling in it when reading her books or watching tv so it makes her happy then I am overall pleased.