96% Polyester, 4% Elastane. Fabric: Fleece, Stretch. Design: Stripe Detail. Fastening: Half Zip. Sleeve-Type: Long-Sleeved. Neckline: Standing Collar, Zip Neck. Flat Locked Seams, Lightweight, Moisture Wicking, Quick Dry. 13 Years, New Baby: 32.5 in. 11-12 Years: 31 in. 14 Years: 34 in. 15-16 Years: 36.5 in. 3-4 Years: 22.5 in. 5-6 Years: 24 in. 7-8 Years: 26.5 in. 9-10 Years: 29 in. Ref: UTRG4502