4.5-ounce 100% polyester AquaFX™ moisture wicking Freshcare™ anti-odor properties Heat transfer label Rib knit 3/4 non-topstitched collar Double-needle sleeves and hem Safety Green is compliant with ANSI/ISEA 107 high visibility standards for background colorDue to the nature of 100% polyester performance fabrics special care must be taken throughout the printing process.