On a silver gray colored vertical rectangle embroidered device arched convexly at top and bottom and edged with a 1/8 inch (.32 cm) blue border, a white map of Texas in the background, with a blue star in base and in the foreground a silhouette of a cowboy astride a bucking bronco blue, fimbriated red. Attached above the rectangle, a silver gray scroll inscribed "PORTER" in blue letters and edged with a 1/8 inch (.32 cm) blue border. Attached below the rectangle, a silver gray scroll inscribed "COWBOYS" in blue letters and edged with a 1/8 inch (.32 cm) blue border. The overall dimensions are 3 1/2 inches (8.89 cm) in height by 2 5/8 inches (6.67 cm) in width.
The cowboy astride a bucking bronco is the school's mascot.
The shoulder sleeve insignia was authorized 8 March 2005.