Personalized Coolest Trombone Player Long Sleeve 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. Pre-shrunk 100% cotton 6.1 ounce long sleeve t-shirt. Double-needle stitched neckline and sleeves. Quarter turned. Shoulder-to-shoulder taping. Adult: S, M, L, XL, 2XL, 3XL