The workhorse long sleeve. 65/35 poly-cotton poplin — enough cotton to breathe on a mild fall morning, enough polyester to hold a press after forty wash cycles and not look like a paper bag by Thursday.
 
Two button-flap breast pockets, a traditional dress collar that holds its shape, and regulation light postal blue that matches everything else in your locker.
 
Built for the route:
 
• 65% polyester / 35% cotton poplin — wrinkle resistant, breathable
• Two button-through flap chest pockets
• Traditional dress collar, permanent stays
• Tails long enough to stay tucked bending for parcels
• Regulation USPS light blue
• Machine wash warm, tumble dry — hang right out of the dryer, skip ironing most weeks
Sizing: True to size in neck and sleeve. If you run between sleeve lengths, go longer — the cuff sits right at the wrist when reaching overhead to sort an apartment bank.
 
Flying Cross is now the standard shirt across the USPS uniform program. Uniform allowance eligible.