Lapco FR KG-15 1/2 M Heavy-Duty 2-Tone Welder's Shirts, 10 oz, 100% Cotton Duck, 12 oz, 15 1/2 Medium, Khaki/Green Four rows of lock stitching on the front placket to prevent unraveling Double needle stitching on pockets, flaps and shoulder seams Stainless steel snaps for stronger attachment and durability Sewn with Nomex thread