100% Polyester. Fabric: 4 Way Stretch, Knitted. Design: Logo. Neckline: Crew Neck. Sleeve-Type: Short-Sleeved. Hem: Side Vents. Fabric Technology: Breathable, Durable, Lightweight, Moisture Wicking, Quick Dry. Reflective Detail. 8 UK: 33.5 in. 10 UK: 36 in. 12 UK: 38 in. 14 UK: 41 in. 16 UK: 44 in.