I have given up. Printed on the front and sleeves.
• 50% cotton, 50% polyester (up to 5% recycled polyester, made from plastic bottles)
• Fabric weight: 7.8 oz/y² (264.5 g/m²)
• Patented low-pill, high-stitch density PrintPro® XP fleece
• Double-needle stitched neckline and armholes
• Ribbed cuffs and waistband