Youth Kids Basketball Jersey Size ⚠ ①Youth S: Chest 18.9 Inch/ Length 22.44 Inch, Fits kids age about 7-11Y,Height: 3'9 - 4'4 ②Youth M: Chest 34.64 Inch / Length 23.62 Inch, Fits kids age about 10-14Y,Height:4'2 -4'7 ③Youth L: Chest 36.22 Inch / Length 24.8 Inch,Fits kids age about 12-16Y,Height: 4'6 -5'1 ④Youth XL: Chest 37.79 Inch / Length 25.59 Inch,Fits kids age about 14-18Y,Height:4'9 -5'4 The Size Chart Just For Reference only, if you don't know what size to choose,send a message to us.thanks. NOTE: ±0.78 Inch Error is normal, Width × 2 = Chest