4 oz./yd, 100% polyester interlock. 40+ UPF rating. Double-needle stitching on neck, sleeves and bottom hem. Perfect for printing or sublimation. Narrower rib collar. Transitioning to tear away label. This product meets the following Sustainable Style subcategories - Socially Conscious Manufacturing - This product was made by a mill that has partnered with or is accredited by the Fair Labor Association.