My 5.5 year old son loves this costume! It arrived this afternoon and he tried it on straight away and wore it all day and even went to bed in it today. I bought a large size 4-6 and it fits well although I think it will outgrow it next year. High quality material for the suit. There are Velcro fasteners on the back. I give 4 stars because the paws are very weird - they have a thumb and 3 fingers! I assume you should wear them as mittens? Or maybe put the fourth and fifth finger in the last section? I doubt he'll wear paws for Halloween because they're so clumsy. But whatever, he loves it!