ASICS Little Boys' Grid Hooded Shirt 100% Polyester Machine Wash 1" high 5.5" wide Cool down poly - fabric designed to move moisture away from the skin as body temperatures rise Stretch - fabric designed to stretch with movement and motion Reflective - reflective materials reflect light back to its source for enhanced visibility Uv protection - good to excellent protection is provided through a 15-50+ upf Flat lock stitch - this stitch keep from chaffing the skin and stretches with movement