Personalized Intelligent Trombone T-Shirt. Trombone, the instrument for intelligent people is a humorous design for musicians, students and teachers of trombone. Fun gifts for back to school, birthdays, holidays and graduation. 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.