The Athletic Racerback tank is made from A4's high-performance 5-Star Fabric. It is perfect for track, softball, marathons or workouts. Features & Benefits: A4's 5-Star Fabric - 4.0 Ounce Micro Poly Interlock Ultra-tight knit for better opacity and printability Stain release and for easy care resistant for durability Double needle cover stitch hem Transitioning to tag free neck