Men's - Ladies' USPS Letter Carrier Flat Knit Sweater size Medium I think these sweaters are warmer than most of the coats the post office issues. These are great used as a liner or just to keep the chill off. Lightweight, Navy blue, Zip front, Embroidered emblem, Machine washable Navy blue zip front cardigan with embroidered emblem. Featuring Pil-trol knit to prevent piling. Lightweight sweater is tightly woven for greater warmth and shape retention. Machine washable.