Personalized Oom-Pa T-Shirt. Oom-Pa tuba playing dad is a humorous music design. Fun gifts for low brass playing fathers and grandfathers at Father's Day, birthdays and holidays. 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.