Personalized Aerobics Instructor Long Sleeve T-Shirt. Aerobics Instructor Long Sleeve T-Shirt - Charcoal gift has a cute pink butterfly logo and makes a lovely present for any fitness coach or teacher. 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