100% Polyester. This hoodie is made from Microfleece fabric with a plain design. It features Anti-Pilling, Breathable, Lightweight, and Quick Dry fabric technology. The hoodie has a hooded neckline and long sleeves. It fastens with a pull-over and quarter zip design. Chest measurements are provided for various sizes: 7-8 Years: 26 in, 2-3 Years: 21.5 in, 11-12 Years: 30.5 in, 9-10 Years: 28.5 in, 5-6 Years: 24 in, 13 Years: 33 in, 3-4 Years: 22.5 in.