Our son was thrilled to be a ninja for halloween.  This was the first year he's been able to really pick his own costume and this piece did the trick for him.  While it was time consuming to put on (for a 5 yr old) once he was dressed he was happy as he could be.  The material is a very thin nylon/poly blend, so if you live in a colder climate, (Like us in Minnesota) you will want to layer warm clothes under the costume.  If you intend to layer, don't worry about ordering a bigger size; the costume is pretty forgiving and even if it is "bulky" kids will enjoy pretending the bulk are strong ninja muscles. Our son's snow boots fit well under the legs of the costume, too, so ultimately keeping your little person warm while trick or treating (and not spoiling the look of their costume by having to wear a a bunch of outerwear) is fairly easy.  our only problem was with the hems unraveling in the hood and the velcro closure coming off entirely which made the hood useless the night we needed it.  I was able to fix the issues later, but for the big day, our son had to make due with a rigged mask.  Overall, though, it is a pretty good costume for the price.  Can't beat it.