This jumper is made of sweatshirt material, so you can play while wearing it. It's not too thick, so you can wear it instead of a sweater. You can also wear a down jacket or similar over it. The front zipper makes it easy to put on and take off during play. I've worn it three times. The size is listed as "1", but it's equivalent to a standard M size. 【Material】 Polyester 95% Polyurethane 5%