Personalized Proud Grandpa Fathers Day T-Shirt. Proud Grandpa T-Shirt - White for Father's Day or a birthday gift has distressed white lettering for your grandfather. 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.