- Solid colored t-shirts are 100% combed ringspun cotton, however, heathered colors could contain a cotton/polyester blend
- Preshrunk to minimize shrinkage
- Double-needle sleeve and bottom hems.
The 31st Infantry Regiment ("Polar Bears") of the United States Army was formed on 13 August 1916, and was part of USAFFE's Philippine Division during World War II. The unit is rare in that it was formed and has spent most of its life on non-American soil.