100% Cotton. Fabric: Fine Knit Gauge, Pre-Shrunk. Design: Plain. Neckline: Crew Neck, Double Seams, Lycra Ribbed, Neckband. Sleeve-Type: Double Seams, Short-Sleeved. Hem: Double Seams. Back Neck Tape, Self Fabric, Tubular. Fit: Loose. 165gsm. Sustainability: No Child Or Forced Labour Used, Oeko-Tex Standard 100 Certified, WRAP Certified. 12-13 Years: 38 in. 14-15 Years: 42 in. 5-6 Years: 31.5 in. 3-4 Years: 30 in. 7-8 Years: 34 in. 9-11 Years: 36 in. 1-2 Years: 24 in. 2-3 Years: 26 in. Ref: UTFK2521