Golden State Warriors Basketball Light Blue Shirt Size Youth M (10/12) NBA.  60% Cotton, 40% Polyester.  Since not all sizes are created equal, I have included actual garment measurements.  Compare with a shirt you own and it is the next best thing to trying it on.  Chest=37".  Back Length=22". Sleeve Length=6.5".  Please contact seller if you require additional measurements or more info so that you can buy with confidence.  Excellent pre-owned condition.  I can't see any signs of wear at all.