Personalized Coolest Trombone Player T-Shirt. A snowman trombone player wearing a music note scarf with the text The world's coolest trombone player is a humorous music design for Christmas and the winter 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.