Mens Oakley black heavy button down shirt

Black Oakley blind button down shirt. Size M/M I guess it is medium? There are 4 front pockets. Left top pocket has a tag sewn on says OAKLEY, under it says Science Wrapped in art. Has other information but to small to read. The elbows down to back of sleeve looks double sewn. . Inch sizes are: arm pit to pit is 22inches. Sleeve is from shoulder seam to end of sleeve is 27inches. Back is 18" from shoulder seam to seam.