Personalized Assistant Coach Planets Best Long Sleeve T-Shirt. Planet's Best Assistant Coach Long Sleeve T-Shirt - Charcoal gift has earth globe logo and room to personalize for the world's best Assistant Coach. 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