Rothco 50185 Work Brown Heavyweight T-Shirt. The comfort and durability of these heavyweight t-shirts were considered throughout design. 60% cotton and 40% polyester make up the sturdy 6.75oz polycotton blend, which is easily resistant to frequent, heavy-duty use. These tough t-shirts stay soft and comfy over a long day of labor or a casual campfire evening. These trustworthy shirts are excellent for field work, outdoor activities, everyday casual wear, formal workwear, and more!