Personalized Proud Firefighter Son In Law T-Shirt. Thin Red LineT-Shirt - Pacific Blue with black and red American flag with fire fighter emblem says Proud Fire Fighter Son In Law. Show your pride in your courageous father in law or mother in law. Everyone loves our Custom T-Shirts! Wardrobe essential for looking good, 24/7. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar. Shoulder-to-shoulder taping. Double-needle stitched sleeves, bottom hem and front neck. Note: greys are a cotton/polyester blend.