Breathable Children's Running Shirt Outer fabric: 100% Polyester Wicking, quick drying, lightweight and comfortable Co... Breathable Children's Running Shirt Outer fabric: 100% Polyester Wicking, quick drying, lightweight and comfortable Contrasting colours, low-friction flat seams Round neckline Reflector transfer and pipings TOPCOOL Microfibre polyester evacuates sweat from the skin to the fabric surface where it evaporates. weight: 140 g/m²