60% Cotton, 40% Polyester. Design: Plain. Neckline: Pleated, Round Neck. Sleeve-Type: Short-Sleeved. Fabric Technology: Breathable, Lightweight. 2-3 Years: 21 in. 3-4 Years: 22 in. 5-6 Years: 24 in. 7-8 Years: 26 in. 9-10 Years: 28 in. 11-12 Years: 31 in.