4.5 oz. 60% ring-spun cotton/40% polyester; 40 UPF rating; Moisture-wicking fabric with dynamic vapor control designed to adjust to body temperature for all day comfort; Light Steel & Charcoal Heather: 90/10 ringspun cotton/polyester; Double-needle cover-seamed neck with 3/4" lay flat collar; Shoulder-to-shoulder tape for durability; Tag-free neck label transitioning to tear-away label. INVENTORY MAY BE MIXED