The Left Field Work Shirts are one of best workwear detailed shirts out there. This iteration is made from a sturdy 12.5oz Japanese twill, similar to the vintage 5 Brother's workshirts from the 1950s. In workwear style, this shirt is sewn with felled seams and features triple needle felled chainstitching throughout, reinforced elbow patches, selvedge gusset, and double front chest pockets. But the best detail of them all are the 1940s vintage reproduction fish eye buttons. These are made of a special copper/tin combination that will develop a beautiful copper patina with wear. As always, the Left Field Work Shirts are made in the USA.