100% Polyester. Fabric: Soft Touch. Design: Ribbed Effect. Sleeve-Type: Long-Sleeved. Neckline: Round Neck. Fabric Technology: Breathable, Lightweight, Moisture Wicking, Quick Dry. 11-12 Years: 30.5 in. 5-6 Years: 24 in. 3-4 Years: 22.5 in. 13 Years: 33 in. 7-8 Years: 26 in. 9-10 Years: 28.5 in. 2-3 Years: 21.5 in. Ref: UTMW528