100% Polyester. Fabric: Anti Pill, Microfleece, Soft Touch. Design: Plain. Fabric Technology: Abrasion Resistant, Anti-Rub, Breathable, Lightweight. Neckline: Funnel Neck. Sleeve-Type: Long-Sleeved. Fastening: Half Zip. 2-3 Years: 21.5 in. 11-12 Years: 30.5 in. 13 Years: 33 in. 3-4 Years: 22.5 in. 5-6 Years: 24 in. 7-8 Years: 26 in. 9-10 Years: 28.5 in. Ref: UTMW3237